@ubIx welcome! Regarding preinstalled apps returning, there is this thread that would be a good one to follow up with. This is marked as solved, but it didn’t have a satisfactory solution. But there are other posts about apps removed via “Preinstalled Apps” not able to be restored correctly. So check those out too, a search on "Preinstalled’ sorted by date would be a good start.
Then let’s see where things are at (after maybe adding / rebooting / removing rebooting).
Regarding the Updater giving an error, this may have been as the server was being updated, but let’s make a separate thread for that if that problem persists.