Click Download backups > download all your backups to your PC
Do a soft reset, then restore from your newest downloaded backup. (Restoring a backup does not change the firmware version, you can restore any backup to any firmware, does not need to match).
If still hanging up, try your next newest backup, etc... try all the backups newest to oldest to see if one will work.
Often times going back one or two backups is what fixes it.
If none of that works, try using Restore Previous Version to roll back to a prior major firmware version, then try the above again.
