Long-press the button to enter the bootloader unlock screen.
(Optional) If your GSI does not have Google Play services baked in, go back to Install, switch to "Install Zip", and flash your package. Once finished, select Reboot System . galaxy a01 custom rom
: Boot back into TWRP recovery. Go to Wipe, select Format Data, type yes , and reboot. This clears encryption conflicts. Issue 2: No Cellular Signal or IMEI Missing Long-press the button to enter the bootloader unlock screen
If the phone repeatedly restarts or hangs on the boot animation for longer than 20 minutes, boot back into your custom recovery environment. Perform another Format Data routine ( yes confirmation) and reboot. : Boot back into TWRP recovery
Check the boxes for , Cache , System , and Data .
This process will permanently trip Samsung's Knox security counter, voiding any remaining warranty.