Update installing_wayne_os_on_a_usb_flash_drive.md

Author: bak-seongbin

docs/en/how-to/installing_wayne_os_on_a_usb_flash_drive.md

@@ -1,38 +1,29 @@
-## Note
-This document is looking foward to your contribution (documentation, translation, reporting, suggestion, coding).
-
 ## 1. Preparation
-- Windows/Linux/Chromebook PC with the same free disk space available as the OS image file
-- A USB flash drive
+- An Wayne OS binary file
+- A USB flash drive which size is greater than the OS binary file size
+- A Windows/Linux/Chrome OS environment with free disk space greater than the OS binary file size.
+  
+## 2. Initialize USB flash drive (optional)
+- If your USB flash drive has an error/corruption, the installation process could fail.
+- [Initialize USB](https://github.com/wayne-incorporated/wayne-os/blob/main/docs/en/how-to/initializing_usb_flash_drive.md).
 
-## 2. [Download Wayne OS binary](http://wayne-os.com/download-wayne-os-binary/)
 
-## 3. Initialize USB flash drive (optional)
-- If your USB flash drive has an error/corruption, the installation process could fail
-- [Initialize USB](https://github.com/wayne-incorporated/wayne-os/blob/main/docs/en/how-to/initializing_usb_flash_drive.md)
+## 3. Write the binary file on USB flash drive
+### In Chrome/Chromium
+- _Chromebook recovery utility_: [download](https://chrome.google.com/webstore/detail/chromebook-recovery-utili/jndclpdbaamdhonoechobihbbiimdgai/RK%3D2/RS%3DUI2uA8SxDAwF_T9oPb4YviZFT3Y-)
+<br> click gear icon/setting on top right > use local image.
 
-## 4. Write .bin file on USB flash drive by image writer tool
-### Windows user
+### In Windows
 - _USBWriter-1.3_: [download](https://sourceforge.net/projects/usbwriter/)
 - _win32diskimager-binary_: [download](https://win32diskimager.download/)
-- _Chromebook recovery utility_: [download](https://chrome.google.com/webstore/detail/chromebook-recovery-utili/jndclpdbaamdhonoechobihbbiimdgai/RK%3D2/RS%3DUI2uA8SxDAwF_T9oPb4YviZFT3Y-)
-<br> click gear icon/setting on top right > use local image.
 - _balenaEtcher-Portable-1.5.109_: This seems not working for Wayne OS installation perfectly
 - _rufus-3.11_: This cannot install Wayne OS exactly
 
-### Chromebook user
-- _Chromebook recovery utility_: [download](https://chrome.google.com/webstore/detail/chromebook-recovery-utili/jndclpdbaamdhonoechobihbbiimdgai/RK%3D2/RS%3DUI2uA8SxDAwF_T9oPb4YviZFT3Y-)
-
-### Linux user
+### In shell
 `$ sudo dd if=${BIN_FILE} of=/dev/${USB_FLASH_DRIVE}`
 <br>
-`${BIN_FILE}` must be .bin file name like wayne-os-usb16g-1q21.bin.
+`${BIN_FILE}` must be the binary file name.
 <br>
 `${USB_FLASH_DRIVE}` must be a device name like sdx, Not a partition name like sdx1.
 <br>
 **Warning: If you write local storage (ex: hdd/ssd) name on it by mistake, you will lose data on the local storage so please check the device name carefully by `lsblk`.**
-<br>
-
-## 5. Check
-- If you install _wayne-os-portable_ version, you can see only a STORAGE partition in Windows/macOS if the installation is succeed
-- Try to boot the USB flash drive on your computer via USB booting from BIOS/UEFI setting