So after running IodéOS for a while I wanted to return to the stock ROM. I Installed it per official install script, so far so good. Now I wanted to relock the bootloader and read about the bricked phones after relocking. I prevented (manually) the phone from rebooting after flashing so fastboot …

Update: got an OTA update, installed it without problems. Made sure this was the right security patch level and was able to lock the bootloader again.

Dear Toos, Now |fastboot flashing get_unlock_ability| returns 0 and the bootloader is still unlocked. As far as I know it the result is 0 then you can’t lock the bootloader. Because there are reports on the forum that it will brick your phone. I am sorry, but that’s all I know.

I see here that rooting the phone and manually changing the toggle of OEM unlocking could be a possibility to, at least, unlock the ciritcal partitions again. But I would rather not go down that route if there are more convenient options available. However I have found none.

You are mixing a lot words here, so be careful and do some reading before flashing although I doubt GrapheneOS will ever be available for FP4 or 5 (however that is not the topic here).

[image] tooshort: Yes the system rebooted after locking critical (that’s when the unlock ability switched to 0 , I’m afraid). So once bootet into the system thats normal…to avoid issues def re-flash-dont boot-check get unlock ability is still 1. if so you should be safe to lock, if still 0 do…

Okay thank you for your reply! I will wait for the OTA update then. I guess because the bootloader is still unlocked I need to sideload it? Do you know if that is possible with the critical partitions locked? And after the OTA is installed I should be able to lock my bootloader again without risk …

I have never done it on my own on FP4 or 5 and always kept my bootloader unlocked on thr FP3. From reading especially about the FP4 it seems easiest would be to re-flash using fastboot now, check-lock when there is a way from keeping the phone booting into system after locking critical… In the past…

Yeah I’m quite hesitant, as IodéOS 4.10 was just released which included security patches from LineageOS 21 (I think), which are newer than the current FP5 release. Thanks for your thoughts though.

Yes true 4.10 most likely had the Feb security update already…then ypu have to wait for the FPOS Feb security update and go from there…

I’m not sure where exactly iodé keeps their different FP5 branches, there’s only staging and according to that the last security bump was in November, which doesn’t seem right :thinking: But then again the FP4 4.10 branch also seems to only have the November update (C.79), quite outdated if that’s …

4.9 def had Jan 24… [image] Install iodeOS on newest security patch fp5 Fairphone 5 I just explained what I see within the OS when this update is installed: [ip_11]

Fairphone Community Forum

Is it safe to lock bootloader?

Help Fairphone 5

yvmuell February 27, 2024, 8:37pm 18

4.9 def had Jan 24…