[everdrive]

I went down this path once.

I researched a phone which should work with lineageOS.

When I received it, I had to find some archaic website and _ask permission_ from a vendor to have the phone unlocked.

From there, I tried to image it from adb and using "guides" (ie, forum posts) and nothing that worked for everyone else ever worked for me.

On paper, installing an aftermarket OS on a phone is not much more difficult than installing an aftermarket OS on a computer. In practice, it's incredibly frustrating and a bit of a crap shoot.