Is anyone having problems installing or updating apps since the update? Things seem to download ok but then I get a message they couldn't install. It looks like error 503? I'm have an unlocked fold 3 on T-Mobile. I've rebooted and tried things like clearing the cache for Google play. Thanks!
I'd try to start in recovery mode, do a 'wipe cache' and a 'repair apps' ...
This might help and does not delete your data. If afterwards the error comes up again, there's still a factory reset to try. But then, all your data are gone and you need to restore a backup.
FYI - my son has an unlocked Fold 3 on T-Mobile as well and he did the upgrade and had no problems. I ended up doing a factory reset and mine is now working but it's just annoying to have to spend time getting it set up again.