I remember you have to install the custom bootloader like TWRP to flash the ROM and there was this thing with A and B partitions. Not sure if things change…
Custom recovery on bootloader-unlockable devices is required if you want to do everything on-device. You can still flash ROMs without a custom recovery. I don’t have a custom recovery on my P9PXL, but that’s only because there isn’t one…
Workarounds on locked devices usually install a custom recovery as part of that workaround. Last night, I installed LOS on one of my kids’ old Kindle Fire tablets. Amazon makes it really difficult, there’s a whole series of scripts and commands just to get TWRP installed. But once that’s done, you can load a ROM and flash it on-device.
Custom recovery on bootloader-unlockable devices is required if you want to do everything on-device. You can still flash ROMs without a custom recovery. I don’t have a custom recovery on my P9PXL, but that’s only because there isn’t one…
Workarounds on locked devices usually install a custom recovery as part of that workaround. Last night, I installed LOS on one of my kids’ old Kindle Fire tablets. Amazon makes it really difficult, there’s a whole series of scripts and commands just to get TWRP installed. But once that’s done, you can load a ROM and flash it on-device.