@JanDoggen THX, I’ll then probably try to reset again during the next weekend. I already unified the partitions, as you might have seen from my previous posts. I also wiped the cache some times.
Strange enough, I noticed some apps do apply their updates, from the play store. However, oeffi, GoogleSearch (sic!) and some other fail with the mentioned error of insufficient storage. (I’m tempted to dub this one the 3StoogesRage bug, as it keeps hitting me. On the head.)