Can't re-lock bootloader after installing e/os

Help Fairphone 5
1

I just received my Fairphone 5, and wanted to install the community version of e/os as it runs Android 14, unlike the “official” one, but I can’t re-lock the bootloader

I was careful about not having a newer security patch version on my phone prior to installing the ROM. I followed the guide: Install /e/OS on a Fairphone FP5 - “FP5”
My problem arises at the last step “fastboot flashing lock”, as soon as I approve on the phone, I end up getting “Your device is corrupt. It can’t be trusted and will not boot.”

I can easily re-flash e/os, but I do feel uneasy leaving the bootloader unlocked.
Device-info:
image

Extra info:
e/os rom: IMG-e-2.7-u-20250110460550-community-FP5
computer OS used: windows 10
(bootloader) get_unlock_ability: 1

2

Not sure if this could help somehow, but maybe it is worth trying to do fastboot erase userdata before relocking.

3

Maybe the same reason for the FP5:

Interesting news!
In the /e/OS documentation there is no mention that the bootloader can only be locked again with the official /e/OS-T version, but not with the /e/OS-T community or /e/OS-U community versions.

See Pixel 7 impossible to relock bootloader - #4 by montotem - Google - /e/OS community

1 Like
4

That would bunmer if that is the reason. I feel like Fairphone would know, so hopefully they share the information.

There’s no date on e/OS-T getting Android 14, but do we know that it will?

5

Please get in contact with the e/OS devs, Fairphone will not help you with issues.with custom rom

6

With community, you can possibly flash avb_custom_key and get a yellow warning on a locked boot loader (be careful, I have not tried, you might get bricked!).

If you want locked bootloader with no warning you have to use the official build, which looks like its still Android 13 for the foreseeable future.

7

I just tried to lock the FP5 (Last step in the instructions) and also made sure the security patch levels where the same date at least.

But locking fails.

I’ve flashed this version: IMG-e-2.7-t-20250111460957-official-FP5.zip