FP4 Flash AVB Custom Key

Help Fairphone 4
1

Hello there,

I have built a custom ROM for the FP4 and am trying to flash it. I am not using a custom key for now, the images are signed using the AOSP default verity key.

I flashed my ROM already and am now trying to flash the avb_custom_key but it miserably fails:

sudo fastboot flash avb_custom_key avb.bin                                                                                 ➜ 0
Sending 'avb_custom_key' (0 KB)                    OKAY [  0.007s]
Writing 'avb_custom_key'                           FAILED (remote: 'Flashing avb_custom_key failed')
fastboot: error: Command failed

I used avbtool to get the raw key from the verity pkcs8:

avbtool.py extract_public_key --key verity.pk8 --output avb.bin

Any ideas what is going on? Also another question, is it possible to disable AVB altogether?

2

Ah nevermind, the partition needs to be erased before we can flash it

sudo fastboot erase avb_custom_key

Then flashing works

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