I want to go back to stock ROM but i can’t re-lock bootloader on fairphone os,fastboot flashing get_unlock_ability 0,can’t lock it,please tell me how to safe re-bootloader

I’ve found a safe way to lock back. That is, after flashing fairphoneos and restarting, hold down the volume key and return to fastboot mode. Then run it again get_unlock_ability 1 and you can safely lock back

You can re-lock the bootloader if your current security patch is newer than the one on the OS you had previously installed. Is your current security patch “newer” than on the OS you had previously installed? Did you come from eOS and install it manually?

flashing get_unlock_ability 0 Means he won’t be able to unlock bootloader if he relock now. He wants to know how to make it 1

I had the same problem yesterday. It was also 0 and I installed FPOS after EOS, the Security Patch Level was newer so I was able to lock bootloader and now I am on FPOS with locked bootloader. The 0 is gone, if I cheak the ability there is a 1 now. The OEM Button is also useable.

[image] de Bootloader Probleme Fairphone 6 Hallo! Ich habe gestern E/Os auf mein Fairphone 6 installiert. Ich habe heute morgen die offizielle Os Version von Fairphone selbst wieder installiert und wollte gerade den Bootlocker schließen und habe vorher geprüft…

Careful! When something goes.wrong the Moment you lock when get unlock abilitiy is 0 the phone is a brick. While you was lucky this should only be done knowing it can go wrong.

For the FP4 de have many many useful info in the forum, searching for get unlock ability should help. Here is one [image] How do I obtain get_unlock_ability set to 1 on an UNLOCKED Fairphone 4? Fairphone 4 Long story short: after trying a bit iodéOS I reinsta…

This is correct! But it it should work if the Security Patch is newer then the one installed before. Anyway there is no garantee.

How to re-lock bootloader safe on fairphone os

Help Fairphone 4

yvmuell August 14, 2025, 6:41am 7

For the FP4 de have many many useful info in the forum, searching for get unlock ability should help.

Here is one