For the record...
Well, hopefully you made a 9.3.3 backup that's still intact.. I always suggest making one in iTunes before updating like that, as most folks have iCloud backup turned on, and I believe those get updated if backup runs after iOS update.. If u try to restore an iOS 10 backup it won't let u.. Then u get stuck setting up as new and losing any data u had on it like pics n vids etc.. If u do have an intact iOS 9 backup somewhere, or don't mind setting up as new, connect to PC, put in DFU mode, fire up iTunes and restore.. Let it do its thing, then restore the iOS 9 backup u hopefully have somewhere. If u don't have iOS 9 backup, setup as new.. Done... If u have pics/ vids on there u absolutely can't live without, you could hook to PC and drag them off just in case before u restore, so at least u have them, or turn on iCloud Photo Library and upload them all there(that's what I do now). But that requires adequate iCloud space and time to upload! I've got 50gb at this point and only 9gb left..it fills up quick.
Originally Posted by katie1892