Hello @Flac, Welcome to the /e/ users forum.
according to [HOWTO] Upgrade my /e/OS to major Android version without loosing /data
answer to questions
- previous firmware base = a14
- provided build base = a15
but because answer to questions
- needed firmware parts included = yes
.
you can have a go to upgrade using options
- using locale update (may refuse to apply because of build signature mismatch)
- not supported on Fairphone
- not supported on Fairphone
- from PC (you will have to confirm installation despite build signature mismatch)
https://ota.ecloud.global/official/FP5/e-3.4-a15-20260114569178-official-FP5.zip