README.md

Tethered iOS 15 Downgrade Guide

Note: As much as I'd like to delete this, what's shown in this repository has been a very thorough learning process that not only I but many others contributed a lot of time into (6+ months). For the sake of preservation, this repository will be archived instead of simply deleted. There are likely some typos and whatnot making certain accessibility oriented commands fail, though anyone with a brain can easily tell what's supposed to be done in order for this to work and I simply don't have the time to perfect everything or cater to idiotic edge cases like I used to.

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Originally written by @mineek for i(Pad)OS 14, modified and updated for simplicity to (theoretically) support every version of i(Pad)OS 15. Please read the guide in its entirety and follow along closely to ensure nothing goes wrong. This guide does not assist with iCloud bypass, activation lock bypass, MDM bypass, etc. as it uses legitimate activation records. The device is rendered useless without them.

This guide was written specifically for iPads running iPadOS 17. While personally untested, devices with i(Pad)OS 16/18 should work, though YMMV (I doubt the iPhone X will work). This guide assumes SEP is compatible. If not, take a look at hell seprmvr64. seprmvr64 might actually work with some knowledge from here, just not out of the box unfortunately.

Additionally, this guide does not take into account devices that have kpp; refer to the original guide by @mineek on kpp. This guide is for MacOS only, though should be 100% possible with Linux if you know what you're doing. Unsure if it works on Apple Silicon, but ensure you don't use an AMD processor if you're using a Hackintosh. For checkm8, you should use a USB-A to Lightning cable. If your device only has USB-C ports, you can use a USB-C to USB-A adapter; most if not all work.

This guide is officially certified as bootloop free assuming you do everything correctly, don't ban me for something that's out of my hands! Remember, this is a tethered boot, not a dualboot. All data on the device will be LOST as a restore takes place.

This guide is assuming you set up your $PATH environment variable to contain a directory which you have access to and can place binaries into. Please edit ~/.bash_profile or ~/.zshrc, whichever exists, to add your working directory into $PATH. For example, you can add export PATH="$PATH:/Users/myusername/Desktop/ios15tether" (replace /Users/myusername/Desktop/ios15tether with your working directory; you can determine this by typing pwd).

This guide is considered complete (in the context of "it just works, I guess") and should work if you follow every instruction with a bit of common sense. If you're aware of what you're doing, and something isn't working right / you have an idea for improvement, please consider making a pull request. If this guide seems too much, please consider looking into downr1n; the people behind it know what they're doing (this tool does not assist with iCloud bypass, activation lock bypass, MDM bypass, etc.). The tool is messy, unorganized, and honestly buggy, though with common sense it works just fine. Hop off Aaron.

Table of Contents

• Requirements
• Obtaining Activation Records
• Firmware Keys
• Restoring
• Booting
• Replacing Activation Records
• Known Problems
• Credits

Requirements

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• You will need the Xcode Command Line Tools; these can be installed with xcode-select --install.
• irecovery - download archive from releases, extract, and run the install-sh binary located in the archives extracted directory.
• futurerestore - download futurerestore-macOS-DEBUG archive from latest GitHub Actions workflow run, extract, and take the futurerestore binary.
• gaster - clone repository, run make, and take the binary made.
• pyimg4 - install the latest version of Python, then run pip3 install pyimg4 (you may need to restart your terminal in order to run the command).
• iBoot64patcher - clone repository, run build.sh, and take the binary made.
• Kernel64patcher - run wget https://github.com/edwin170/Kernel64Patcher/raw/master/Kernel64Patcher_Darwin -O Kernel64Patcher && chmod +x Kernel64Patcher, and take the binary downloaded.
• img4tool - download archive from releases, extract, and take the binary located at {extracted archive directory}/usr/local/bin/img4tool.
• img4 - recursively clone repository, run make -C lzfse && make, and take the binary made.
• restored_external64_patcher - clone repository, run make, and take the binary made.
• asr64_patcher - clone repository, run make, and take the binary made.
• Homebrew - if you do not already have homebrew on your system, run /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" in a terminal (I'm so sorry for this).
• sshpass - if you do not already have sshpass on your system, run brew tap esolitos/ipa && brew install sshpass in a terminal.

Note: Please make sure you are using the repositories listed above. Using outdated / modified forks / binaries can and will make it so this guide doesn't work. These tools MUST be under the $PATH environment variable.

You will need an .shsh2 blob from your device. For simplicity sake, you can use blobsaver (download and install the .dmg from releases). Connect your device, read the ECID from the device, and press "Go". Once finished, take the .shsh2 with the latest i(Pad)OS version listed from the directory listed (may be ~/Blobs), copy it to your working directory, and rename it to shsh.shsh2. You cannot use a blob dumped from your device (aka. an "onboard" blob). Blobs from blobsaver work just fine.

Obtaining Activation Records

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You will need to back up your activation records in order to activate & use the device (if you're thinking about bypassing, you won't be able to jailbreak the device if you patch AMFI). Before restoring your device, update it to latest, activate the device (get to the home screen), jailbreak it (you can use palera1n) and install Filza File Manager from Sileo / Zebra.

1. Open Filza. You should be accessing the following files and directories from the root filesystem.
2. Open /var/mobile/Documents and make a folder named Activation (you can favorite this directory for ease of access).
3. Open /var/containers/Data/System. Then, open the folder that Filza says is com.apple.mobileactivationd. Then, open Library (you can favorite this directory for ease of access).
4. From activation_records, copy activation_record.plist to /var/mobile/Documents/Activation.
5. From internal (next to activation_records), copy data_ark.plist to /var/mobile/Documents/Activation.
6. Open /var/containers/Data/System. Then, open the folder that Filza says is com.apple.fairplayd.A2. Then, open Documents/Library. Copy the FairPlay folder and paste it into /var/mobile/Documents/Activation.
7. From /var/wireless/Library/Preferences, copy com.apple.commcenter.device_specific_nobackup.plist to /var/mobile/Documents/Activation.
8. Open /var/mobile/Documents and select "Create ZIP" on the Activation folder. Hold down the .zip, press "Open in", and select "Save to Files".
9. Upload the .zip to your computer by either going to tmpfiles.org and opening the download link on your computer or using FTP / SSH / SFTP. Save the .zip to your working directory and extract it. Make sure the Activation folder is inside of your working directory (if the files spill into your working directory, run mkdir Activation && cp activation_record.plist com.apple.commcenter.device_specific_nobackup.plist data_ark.plist FairPlay Activation).

Once the Activation folder is on your computer, chmod it with sudo chmod -R 755 Activation (assuming you're in the directory that has the Activation folder).

Firmware Keys

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In order to restore and boot your device, you need to obtain keys for your devices target versions iBoot, iBEC, iBSS, and LLB. One source futurerestore looks to for keys is The Apple Wiki, so you can check there for keys.

If the link for your device & version combination is blue (and has keys visible when you click it, you can skip to Restoring. If the link for your device & version combination is red, you will need to do extra work, please continue with this section.

A dead simple software I like to use is Criptam, though at the time of writing it's broken. Assuming a fix isn't pushed yet (please check the repository), here's a fork (develop branch) I provided where you can input data via a .json file. You can use it like so:

1. Install Poetry by running curl -sSL https://install.python-poetry.org | python3 -.
2. Clone the fork mentioned above using git clone https://github.com/imnltsa/Criptam --branch develop.

Your device identifier can be found by going to ipsw.me, selecting your devices model, and clicking the "Device Information" tab. Alternatively, you could refer to this GitHub Gist, though pictures may be easier for you. It'll look similar to iPad7,1, take a note of this as your identifier.

When you select a version on ipsw.me, you will see the build identifier for that version in parenthesis (ie. 19H12 is the build identifier for iPadOS 15.7). Take note of this as the build identifier for the version you want keys of.

3. From the repositories main directory, run ./install.sh to build and install the fork of Criptam.

Now, we need to supply the fw.json. You can get this by running wget https://api.ipsw.me/v4/device/{deviceid} -O fw.json, where {deviceid} is the device identifier of your device (ie. iPad7,1), just remember to not include the {}. Ensure you're cd'd into the directory where the fw.json fie is saved. Please remember you need to update this file if a new version comes out for your device and you wish to obtain keys for it.

For example, running a command like wget https://api.ipsw.me/v4/device/iPad7,1 -O fw.json will give me the firmware data for the iPad Pro 2 (12.9-inch, WiFi).

4. Run the following command: criptam -d {deviceid} -b {buildid}, where {deviceid} is your device identifier (ie. iPad7,1), and {buildid} is the build identifier of the version you want keys of (ie. 19H12 for iPadOS 15.7), just remember to not include the {}.

For example, running a command like criptam -d iPad7,1 -b 19H12 will give me the keys for the iPad Pro 2 (12.9-inch, WiFi) on iPadOS 15.7.

Take a note of these keys; they will be used to decrypt iBEC and iBSS in the boot process. Though, now we need to set up a server for futurerestore to reference for the restore process. Remember, ivkey stands for the IV concatenated with the Key; if IV were 123 and the Key were 456 the ivkey would be 123456. Here's a layout of what you should save:

Firmware keys:
iBSS IV: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
iBSS Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

iBEC IV: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
iBEC Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

LLB IV: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
LLB Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

iBoot IV: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
iBoot Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

A good reminder of the device & version combination is to write the device identifier and build identifier in your note, so you should do something like replacing

Firmware keys:

with

Firmware keys for J120AP 19H12:

You can now serve these keys on your localhost server for futurerestore.

1. Install prerequisites with pip3 install requests pyquery Flask.
2. Download proxy.py with wget https://raw.githubusercontent.com/imnltsa/ios15tether/main/proxy.py. Ensure this is run in your working directory.
3. In another terminal window, type python3 proxy.py.

Now, you need to make the .json file for the restore. In your working directory, make a file named {deviceid}+{buildid}.json, where {deviceid} is the device identifier (ie. iPad7,1) and {buildid} is the build identifier for the version you're going to (ie. 19H12), just remember to not include the {}. For example, the iPad7,1 with the 19H12 build identifier should have its .json file named iPad7,1+19H12.json.

Open the .json file and structure it as follows:

{
    "identifier": "",
    "buildid": "",
    "codename": "",
    "keys": [
        {
            "image": "iBEC",
            "filename": "",
            "date": "",
            "iv": "",
            "key": "",
            "kbag": ""
        },
        {
            "image": "iBoot",
            "filename": "",
            "date": "",
            "iv": "",
            "key": "",
            "kbag": ""
        },
        {
            "image": "iBSS",
            "filename": "",
            "date": "",
            "iv": "",
            "key": "",
            "kbag": ""
        },
        {
            "image": "LLB",
            "filename": "",
            "date": "",
            "iv": "",
            "key": "",
            "kbag": ""
        },
        {
            "image": "SEPFirmware",
            "filename": "",
            "date": "",
            "iv": "Unknown",
            "key": "Unknown",
            "kbag": ""
        }
    ]
}

• In the identifier key, add the device identifier (ie. iPad7,1).
• In the buildid key, add the build identifier (ie. 19H12).
• In the codename key, add the codename for the version you're going to. For iOS 15, you can use Wikipedia for codenames (ie. SkySecuritySydney for 15.7).

The rest should be quite self explanatory. For iBEC, iBoot, iBSS, and LLB, you need to input the filename (which is the name of the corresponding file in the .ipsw), along with the iv & key of the file (which you can get from your results with Criptam).

While in your working directory, run this to get the filenames of every component you need (your device must be connected in DFU in order for irecovery to work):

rm BuildManifest.plist && cp extipsw/BuildManifest.plist .
boardconfig=$(irecovery -q | awk '/MODEL/ {print $NF}')
echo -e "\niBSS is: $(awk "/""${boardconfig}""/{x=1}x&&/iBSS[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)"
echo "iBEC is: $(awk "/""${boardconfig}""/{x=1}x&&/iBEC[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)"
echo "iBoot is: $(awk "/""${boardconfig}""/{x=1}x&&/iBoot[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)"
echo "LLB is: $(awk "/""${boardconfig}""/{x=1}x&&/LLB[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)"
echo -e "SEPFirmware is: $(awk "/""${boardconfig}""/{x=1}x&&/sep-firmware[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)\n"

Copy the FILENAMES (ie. iBEC.j120.RELEASE.im4p NOT Firmware/dfu/iBEC.j120.RELEASE.im4p) into their corresponding filename keys.

You do NOT need to fill SEPFirmware iv or key. You do not need to fill any kbag keys.

You can now restore, hooray! Don't forget to keep python3 proxy.py running.

Restoring

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Take note of the board configuration of your device. When you're looking at the version list on ipsw.me, click the "Device Information" tab and note the BoardConfig. For example, the iPad Pro 2 (12.9-inch, WiFi) has a BoardConfig of J120AP.

1. Get an .ipsw of the 15.x version you want to go down to. You can download this from ipsw.me. Once you obtain the .ipsw, rename it to ipsw.ipsw and copy it to your working directory.
2. Extract the .ipsw with unzip ipsw.ipsw -d extipsw.
3. From the extipsw directory, copy the kernel cache. The kernel cache should be at the root of the extracted extipsw directory and named after your device (ie. kernelcache.release.ipad7 for the iPad7,x, a shortened version related to the device identifier). Copy the kernel cache to your working directory and rename it to kernelcache.
4. From the extipsw directory, copy the restore ramdisk; you can identify this using the build manifest. You can open BuildManifest.plist with TextEdit by either using Finder or open -e BuildManifest.plist. Search for "RestoreRamDisk" and look for the second result. Look a couple lines beneath, until you see <key>Path</key> under the RestoreRamDisk key and dictionaries. The <string> underneath the Path key is the name of the restore ramdisk .dmg. Copy the .dmg with the same name as the .dmg in the <string></string> to your working directory, and rename it to restore_ramdisk.
5. Extract the ramdisk with img4 -i restore_ramdisk -o ramdisk.dmg.
6. Mount the ramdisk with mkdir ramdisk && hdiutil attach ramdisk.dmg -mountpoint ramdisk.
7. Patch asr with asr64_patcher ramdisk/usr/sbin/asr patched_asr.
8. Resign the patched asr with ldid -e ramdisk/usr/sbin/asr > ents.plist && ldid -Sents.plist patched_asr.
9. Copy restored_external from the ramdisk with cp ramdisk/usr/local/bin/restored_external ..
10. Patch restored_external with restored_external64_patcher restored_external restored_external_patched.
11. Extract the entitlements from restored_external with ldid -e restored_external > restored_external_ents.plist.
12. Remove the unpatched asr and restored_external from the ramdisk with rm ramdisk/usr/sbin/asr && rm ramdisk/usr/local/bin/restored_external
13. Sign restored_external_patched with ldid -Srestored_external_ents.plist restored_external_patched.
14. Change permissions of the patched files to 755 with chmod -R 755 restored_external_patched && chmod -R 755 patched_asr.
15. Copy restored_external_patched and patched_asr into the ramdisk replacing the original files with cp -a restored_external_patched ramdisk/usr/local/bin/restored_external && cp -a patched_asr ramdisk/usr/sbin/asr.
16. Detach the ramdisk with hdiutil detach ramdisk.
17. Turn the ramdisk .dmg into an .im4p with pyimg4 im4p create -i ramdisk.dmg -o ramdisk.im4p -f rdsk.
18. Extract the kernel cache with pyimg4 im4p extract -i kernelcache -o kcache.raw.
19. Patch the kernel cache with Kernel64Patcher kcache.raw krnl.patched -f -a.
20. Rebuild the kernel cache with pyimg4 im4p create -i krnl.patched -o krnl.im4p -f rkrn --lzss.

Now that your restore files are prepared, you can restore the device with futurerestore.

Optional: If you want the device to be in recovery mode instead of DFU on boot (essentially removing the 'fake DFU' from Known Problems), you can replace LLB by updating the .ipsw with an LLB signed by your .shsh2. In order to do that, run the following commands in your working directory (replace {ipsw url} with the .ipsw URL of the i(Pad)OS version that your .shsh2 comes from, just remember to not inculde the {}):

mkdir -p Firmware/all_flash
cp extipsw/BuildManifest.plist .
boardconfig=$(irecovery -q | awk '/MODEL/ {print $NF}')
cd Firmware/all_flash
pzb -g "Firmware/all_flash/$(awk "/""${boardconfig}""/{x=1}x&&/LLB[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1)" {ipsw url}
cd ../..
zip -ur ipsw.ipsw Firmware/all_flash/

Optional: If you replaced LLB and want the device to have a graphic when the device is in recovery mode instead of the backlight simply being on, you can replace the RestoreLogo by updating the .ipsw with a RestoreLogo signed by your .shsh2. In order to do that, run the following commands in your working directory (assuming you already did LLB, replace {ipsw url} with the .ipsw URL of the i(Pad)OS version that your .shsh2 comes from, replace {recoverymode} with the .im4p filename of your devices recoverymode .im4p; if there is only one recoverymode .im4p in the .ipsw (you can use pzb -l {ipsw url} to see the contents of the .ipsw), use that, otherwise use the .im4p related to your screens resolution (ie. recoverymode@2732~ipad-lightning.im4p for the iPad Pro 2 (12.9-inch) as it has a 2732 by 2048 screen resolution (Google yours!), just remember to not include the {}):

boardconfig=$(irecovery -q | awk '/MODEL/ {print $NF}')
cd Firmware/all_flash
pzb -g "Firmware/all_flash/{recoverymode}" {ipsw url}
cd ../..
zip -ur ipsw.ipsw Firmware/all_flash/

You can likely add the rest of the firmware payloads from the .ipsw following the same process above, though I won't be covering those specifically here since they're less important. From personal experience, it doesn't seem like "BatteryLow" works, and having your device be in a state where the payload would be shown simply results in a bootloop (just charge your device or turn it off). The Apple logo payload being replaced does in fact bring back the Apple logo (can even be seen during userspace reboots).

In order to restore the device, you need to first exploit the device with gaster. Put your device into DFU mode and run gaster pwn && gaster reset. If gaster hangs or goes into a loop, redo the combination for entering DFU mode and run the command again.

If your device has a baseband, run futurerestore -t shsh.shsh2 --use-pwndfu --skip-blob --rdsk ramdisk.im4p --rkrn krnl.im4p --latest-sep --latest-baseband ipsw.ipsw. If your device does not have baseband, change --latest-baseband to --no-baseband. If you are unsure whether or not your device has baseband, try the command with --latest-baseband; the restore will fail (your data is untouched) if futurerestore errors due to your device not having baseband.

Note: If keys are available on The Apple Wiki but futurerestore is unable to obtain them, look into m1stadev/wikiproxy. Similar to proxy.py, it allows futurerestore to reference The Apple Wiki for firmware keys. Ensure wikiproxy is running while running futurerestore so the keys can be obtained successfully.

Booting

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We need to copy more files from the extipsw directory. DeviceTree may be named after your board configuration (ie. J120AP), though other components are likely named differently. Please make sure to get the correct files for your device.

While in your working directory, run this to copy and rename the required components (your device must be connected in DFU in order for irecovery to function):

rm BuildManifest.plist && cp extipsw/BuildManifest.plist .
boardconfig=$(irecovery -q | awk '/MODEL/ {print $NF}')
cp -v extipsw/$(awk "/""${boardconfig}""/{x=1}x&&/iBSS[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1) ibss
cp -v extipsw/$(awk "/""${boardconfig}""/{x=1}x&&/iBEC[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1) ibec
cp -v extipsw/$(awk "/""${boardconfig}""/{x=1}x&&/DeviceTree[.]/{print;exit}" BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1) devicetree

In extipsw, you should locate the largest .dmg's name. For example, the J120AP 19E258 root filesystem .dmg is named 078-28735-012.dmg. From extipsw/Firmware, copy the .trustcache for the root filesystem .dmg (ie. 078-28735-012.dmg.trustcache) to your working directory and rename it to rootfs_trustcache.

Lastly, you need to reopen BuildManifest.plist. Search for IsFUDFirmware and look through every results entire dictionary; if the Path <key> has a <string> that shows a file ending in .im4p, copy the corresponding files to your working directory. These files are all inside of the extipsw directory.

Please refer to the Firmware Keys section of this guide to get ivkey's. If they are on The Apple Wiki, you may use them here. Otherwise, please follow the Criptam guide in getting the keys. Remember, ivkey means the IV concatenated with the Key. If the IV is 123 and the Key is 456, the ivkey is 123456. The keys must be for your exact device and exact i(Pad)OS version you want to go to.

1. Decrypt your ibss with img4 -i ibss -o ibss.dec -k {ibss ivkey}, where {ibss ivkey} is the ivkey for iBSS, just remember to not include the {}.
2. Decrypt your ibec with img4 -i ibec -o ibec.dec -k {ibec ivkey}, where {ibec ivkey} is the ivkey for iBEC, just remember to not include the {}.

If you want to ensure your keys are correct, open either ibss.dec or ibec.dec in a text editor; you should immediately see "Copyright 2007-20xx, Apple Inc." near the top. If the entire file is gibberish, the keys are invalid.

3. Patch iBSS with iBoot64Patcher ibss.dec ibss.patched.
4. Patch iBEC with the verbose boot argument with iBoot64Patcher ibec.dec ibec.patched -b "-v".
5. Create an IM4M with img4tool -e -s shsh.shsh2 -m IM4M.
6. Repack iBSS with img4 -i ibss.patched -o ibss.img4 -M IM4M -A -T ibss.
7. Repack iBEC with img4 -i ibec.patched -o ibec.img4 -M IM4M -A -T ibec.
8. Sign device tree with img4 -i devicetree -o devicetree.img4 -M IM4M -T rdtr.
9. Sign root filesystem trustcache with img4 -i rootfs_trustcache -o rootfs_trustcache.img4 -M IM4M -T rtsc.

Now, you need to sign every .im4p that was copied when you searched IsFUDFirmware in the BuildManifest.plist. Run img4 -i {im4p filename} -o {img4 filename} -M IM4M -T {tag}, where {im4p filename} is the filename of one firmwares .im4p filename (ie. aopfw.im4p), {img4 filename} is the filename with .im4p replaced with .img4 (ie. aopfw.img4), and {tag} is the TYPE of the firmware (ie. aopf), just remember to not include the {}. Make sure you do every firmware.

10. Patch the kernel cache with Kernel64Patcher kcache.raw krnlboot.patched -b15 -r -o -e, make sure you are using the correct fork!
11. Repack the kernel into an .im4p with pyimg4 im4p create -i krnlboot.patched -o krnlbootim4p -f rkrn --lzss.
12. Repack the kernel into an .img4 with pyimg4 img4 create -p krnlboot.im4p -o krnlboot.img4 -m IM4M.

You're now ready to boot. You can automate the boot process by copying your iBEC, iBSS, device tree, krnlboot, root filesystem trustcache, and all firmware .img4's into a separate directory for ease of access.

To boot the device, you need to enter DFU mode, run gaster pwn && gaster reset, and run the following commands (do NOT run irecovery -c go if your device does not have an A10 or higher chipset):

irecovery -f ibss.img4
sleep 2
irecovery -f ibec.img4
{go}
sleep 2
irecovery -f devicetree.img4
irecovery -c devicetree
{firmwares}
irecovery -f rootfs_trustcache.img4
irecovery -c firmware
irecovery -f krnlboot.img4
irecovery -c bootx

If your device has an A10 or above chipset (Google your device name alongside the word "chipset"), replace {go} in the command with irecovery -c go. If your device is not A10 or above, do not add anything (remove {go}).

For {firmwares}, you need to send every IsFUDFirmware firmware made into an .img4. You need to replace {firmwares} with these two lines for every firmware:

irecovery -f {firmware img4 filename}
irecovery -c

where {firmware img4 filename} is the .img4 filename of the firmware (ie. aopfw.img4), just don't include the actual {firmwares}. You can save this elsewhere as boot.sh (make sure to copy all files required too!). Here's an example of boot.sh for the J120AP 19E258 with LLB and the recovery mode .im4p replaced:

palera1n -D # DFU helper (must replace LLB and recoverymode .im4p)
gaster pwn
gaster reset
irecovery -f ibss.img4
sleep 2
irecovery -f ibec.img4
irecovery -c go
sleep 2
irecovery -f devicetree.img4
irecovery -c devicetree
irecovery -f avefw.img4
irecovery -c firmware
irecovery -f aopfw.img4
irecovery -c firmware
irecovery -f rootfs_trustcache.img4
irecovery -c firmware
irecovery -f krnlboot.img4
irecovery -c bootx

Since (besides the root filesystem trustcache) there is the AVE and AOP firmware, they've both been added along with their -c commands. Since the device is A10X, it includes -c go. Do not use this script for your device; please only use it as a template. You need to keep in the sleep commands though, and if they are insufficient, make them a few seconds longer.

Replacing Activation Records

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Once the device has booted, attempt to set up the device. You'll be met with an error saying "Unable to Activate", this is normal.

1. Clone and enter SSHRD_Script with git clone --recursive https://github.com/verygenericname/SSHRD_Script && cd SSHRD_Script.
2. Redo the button combination to enter DFU mode.
3. Make a ramdisk by running ./sshrd.sh {version}, where {version} is the i(Pad)OS version you restored to (ie. 15.7). If the script hangs on "Getting device info and pwning", restart from step 2. If the script stops on "[-] An error occurred", restart from step 3.
4. Boot the ramdisk with ./sshrd.sh boot. Wait for the device to stop moving text on the screen.
5. Enter SSH with ./sshrd.sh ssh.

In the SSH terminal, run the following commands:

mount_filesystems
find /mnt2/containers/Data/System -name internal

The second command will return something along the lines of /mnt2/containers/Data/System/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/Library/internal. Take off /Library/internal at the end and put it into the next command (after rm -rf):

rm -rf /mnt2/containers/Data/System/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX

6. Enter DFU mode and boot the device normally by Booting. Attempt to activate the device again.
7. Redo the button combination to enter DFU mode.
8. Boot into the ramdisk by running ./sshrd.sh boot. Wait for the device to stop moving text on the screen.
9. Enter SSH with ./sshrd.sh ssh.
10. Mount filesystems with mount_filesystems. Wait until the command finishes.
11. Run exit. Then, run cd Darwin && killall iproxy && ./iproxy 2222 22 & (ignore process not found error).
12. Run ./iproxy 2222 22 &.

This terminal tab will be running in the background, you do not need to interact with it!

13. Open a new terminal tab / process and cd into the SSHRD_Script directory. Then, connect to SSH with ./sshrd.sh ssh.

This terminal tab will be referred to as the "SSH console".

14. Open a new terminal tab / process.

This terminal tab will be referred to as the "normal console".

In the normal console:

sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 rm -rf /mnt2/mobile/Media/Downloads/1
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 rm -rf /mnt2/mobile/Media/1

In the SSH console:

mkdir /mnt2/mobile/Media/Downloads/1
mkdir /mnt2/mobile/Media/Downloads/1/Activation

In the normal console (ensure you are in your working directory, and the Activation folder with activation records exists in the current directory):

sshpass -p alpine scp -rP 2222 -o StrictHostKeyChecking=no Activation root@localhost:/mnt2/mobile/Media/Downloads/1
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mv -f /mnt2/mobile/Media/Downloads/1 /mnt2/mobile/Media

In the SSH console:

chown -R mobile:mobile /mnt2/mobile/Media/1

In the normal console:

sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod -R 755 /mnt2/mobile/Media/1
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 644 /mnt2/mobile/Media/1/Activation/activation_record.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 644 /mnt2/mobile/Media/1/Activation/data_ark.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 644 /mnt2/mobile/Media/1/Activation/com.apple.commcenter.device_specific_nobackup.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 killall backboardd
sleep 12
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mv -f /mnt2/mobile/Media/1/Activation/FairPlay /mnt2/mobile/Library/FairPlay
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 755 /mnt2/mobile/Library/FairPlay
ACT1=$(sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 find /mnt2/containers/Data/System -name internal)
ACT2=${ACT1%?????????????????}
ACT3=$ACT2/Library/internal/data_ark.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chflags nouchg $ACT3
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mv -f /mnt2/mobile/Media/1/Activation/data_ark.plist $ACT3
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 755 $ACT3
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chflags uchg $ACT3
ACT4=$ACT2/Library/activation_records
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mkdir $ACT4
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mv -f /mnt2/mobile/Media/1/Activation/activation_record.plist $ACT4/activation_record.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 755 $ACT4/activation_record.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chflags uchg $ACT4/activation_record.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chflags nouchg /mnt2/wireless/Library/Preferences/com.apple.commcenter.device_specific_nobackup.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 mv -f /mnt2/mobile/Media/1/Activation/com.apple.commcenter.device_specific_nobackup.plist /mnt2/wireless/Library/Preferences/com.apple.commcenter.device_specific_nobackup.plist

(Ignore any errors related to processes)

In the SSH console:

chown root:mobile /mnt2/wireless/Library/Preferences/com.apple.commcenter.device_specific_nobackup.plist

In the normal console:

sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chmod 755 /mnt2/wireless/Library/Preferences/com.apple.commcenter.device_specific_nobackup.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 chflags uchg /mnt2/wireless/Library/Preferences/com.apple.commcenter.device_specific_nobackup.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 launchctl unload /System/Library/LaunchDaemons/com.apple.mobileactivationd.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 launchctl load /System/Library/LaunchDaemons/com.apple.mobileactivationd.plist
sshpass -p alpine ssh -o StrictHostKeyChecking=no root@localhost -p 2222 ldrestart

(Ignore any errors related to commands not being found)

15. Enter DFU mode and boot the device normally by Booting. Attempt to activate the device again.

Known Problems

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• As the name suggests, this is a tethered boot. You need access to a computer every time you want to boot if the device dies or panics. While stability is essentially perfect, the device can still panic while jailbreaking, so if you intend to jailbreak please do so before you lose access to a computer.
• Activation records cannot be used twice (somewhat). While you can activate and use the device, you cannot log in to iCloud. You need to restore the device to latest, activate the device, back up the new activation records, restore to 15.x, and add the new activation records. Also, it seems like they expire after a certain amount of time (?), though I'm unsure if it was just a fluke.
• AltStore / SideStore / Sideloadly etc. will not work (this also includes applications installed via itms-services://) as you cannot verify applications from "VPN(, DNS,) & Device Management". If your device does not support TrollHelperOTA, follow these steps to install TrollStore:

1. Install Tips from the App Store.
2. In the SSHRD_Script directory, run ./sshrd.sh {version} TrollStore Tips, where {version} is the i(Pad)OS version you downgraded to, just remember to not include the {}.
3. Boot the new ramdisk with ./sshrd.sh boot. Wait for the installation to finish.
4. Remove the TrollStore ramdisk with ./sshrd.sh clean.
5. Enter DFU mode and boot the device normally by Booting.

TrollStore Helper should now be installed into the Tips app. Open the Tips app and install TrollStore. If Tips doesn't say "Uninstall Persistence Helper", register Tips as a persistence helper.

• Currently, you cannot set a passcode / enable any biometrics. Your device will panic if you enable a passcode, though a force reboot reverts the changes. If jailbroken, you can install FakePass, though it will only work while jailbroken. Install the tweak, respring, and attempt to set a passcode in the Settings app. This tweak does not provide real security, though would prompt a potential intruder to restore the device as rebooting simply enters DFU (they cannot boot as they do not have the required files). Please do not keep sensitive information on the device, even if you are jailbroken 24/7 as either simply forgetting to jailbreak or someone knowing what files are required to boot instantly compromise the security of your device.
• If you didn't replace LLB, the device will look bricked after a reboot as it's now in a kind of "fake" DFU mode. You will still need to do the DFU mode button combination to enter real DFU, else running gaster pwn will make your terminal go in a loop (press Ctrl + C to stop gaster). If LLB is replaced, you can use normal DFU helpers like palera1n -D or holding the DFU mode button combination, you just don't need to worry about "fake" DFU. You can turn off the device by holding the force reboot button combination and letting go once the device backlight turns off (assuming LLB is replaced).
• A tweak that causes SpringBoard to crash may put your device into a respring loop, albeit unlikely. Hold the Volume Up button while the device is respringing to enter safe mode if this occurs (you may need to keep the button held down upwards of 30 seconds).
• You need to have opened the Messages app first to be able to enable Messages in iCloud settings.
• Cellular service should work, though is untested.
• The ability to make calls should work, though is untested.
• The ability to send and receive SMS texts should work, though is untested.
• You may be unable to view iCloud keychain passwords.
• You may be unable to use Sidecar.

Credits

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• @mineek for writing the original guide and providing general support concerning this repository.
• @edwin170 for providing general support concerning this repository.
• @pwnapplehat for updating the orangera1n activation records guide.
• All developers & repository owners of the software used in this guide listed under Requirements.