Have a look on xdaforums for your device, there will be guides. With the Samsung for example you have to enable bootloader flashing in existing rom developer options otherwise it will overwrite on a fresh boot. Gxda is a trove of info though
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It looks like the native OS will flash the original recovery partition back if you try to boot Android without flashing a custom. ROM.
so if I cannot install lineage on my device (package no longer maintained) and I'm stuck with the native OS, that means I'm also stuck with the original recovery partition and cannot install TWRP?
Oh that's interesting. Never seen that before.
The same thing can be seen on some MIUI device that i used before. Need to quickly press the recovery keys combination to enter TWRP. Entering recovery command from terminal would directly boot into OS.
You need to unlock your bootloader.
Enable USB debugging in the developer options;
Reboot the phone in fastboot;
Connect the phone to your PC;
Run the commands bellow, line by line:
touch key.txt
fastboot oem get_unlock_key key.txt
fastboot reboot-bootloader
It should show a warning that the bootloader is unlocked;
Reboot in fastboot and install TWRP again.
Its been a while since i tinkered around but i think firstly you can try directly booting into twrp recovery and see if that's working.
For some phones overwriting the recovery straight away doesn't work they will just let you temporarily run custom recoveries.
If that's the case then you can figure out for your specific phone how to overwrite the stock recovery permanently.
Again i could be completely wrong but you can give this flow a try.
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