Upgrade with Updater from Google Play

I have Fairphone OS 19.12.1-beta1 installed on my Fairphone 2.
Fairphone Updater has version 1.39.17

Google Play tells me now that the update for Fairphone Updater 1.50.1 10.03.2021 isn’t compatible with my phone and can’t be updated.

Sounds a little bit strange. So how to upgrade to Android 9 when I can’t even update the updater?

A post was merged into an existing topic: FP2: Fairphone OS 21.01.0-rel.1 (Android 9 release candidate)