Then there's something seriously wrong somewhere, which might go hand in hand with your complaints in your other thread.
This is beginning to look like a deliberate attempt to damage the reputation of the CF. To be clear: on a normal, properly working HDR-FOX, installing or updating CF DOES NOT affect the existing recording schedule, and use of the CF DOES NOT result in pixelated programmes/recordings.
However, if you had simply said there were missing items after a schedule restore, without linking this to a CF update, everything would have been fine.
Schedule restore tries to match items in the backup with items in the current EPG. If it can't match them, it can't restore them. One way to check whether the items in question were in the backup at all is to view the backup listing.