How to Flash a Custom ROM without TWRP Recovery - DroidWin
In this tutorial, we will show you how to flash Custom ROM without usng TWRP Recovery. We would be using Fastboot Commands and in some cases, Python.
Unbrick OnePlus 9RT: Flash Firmware via Fastboot Commands
Suppose you wish to flash vbmeta to Slot A, then the command will become: fastboot flash vbmeta_a vbmeta.img.
Bricked? Can't change slots, can't flash bootloader!
Compiled the OS with `TARGET_USE_AB_SLOT=true` ... fastboot set_active a` fails as well with the error `Device does not support slots`.