API: porsche: Update instructions

API/instructions/porsche.md

@@ -1,7 +1,22 @@
-# Clean flash coming from RUI 4.0 C.xx firmware:
+# Clean flash:
+- I recommend being on RealmeUI 4.0 firmware version C.14 or newer before flashing
+  to avoid any possible issues.
 - Reboot to bootloader
 - Flash boot, vendor_boot and dtbo images
 - Reboot to recovery
+- Sideload ROM zip
 - Format data
+- Reboot and voila!
+
+# Updating to a newer build (dirty flash):
 - Sideload ROM zip
 - Reboot and voila!
+
+# If sideloading rom gives error 7:
+- Reboot to recovery
+- Enter fastbootd
+- fastboot wipe-super super_empty.img
+- Enter recovery
+- Sideload the rom zip
+- Format data
+- Reboot