Hi, I have a Fairphone 4 for sale in perfect condition about 3 weeks old. It is a 128GB 6GB device which was running on Ubuntu Touch but I have put the Android OS back on the phone.
Brick a device never happend to me, you need to know what you are doing… No i dont have register the device for 5 years so it can still be registered on the new owner…
it can only be registered I think within 90 days, just as a reminder for a potential buyer. Reg the bricking: its a bug in the system and even if you know what you do, you can easily brick it at the moment as the get unlockability is often set to 0 and then there is no way to enable OEM unlocking once the bootloader is locked.
I assume as you are a developer you are aware of this issue and you would ensure to test the sensors after installing FPOS