Hi to all, like many others, I learned the hard way iOS 9.2 isn't compatible with iTunes 11.4 on Snow Leopard. First a quick background: I bought a used iPhone 5c from a friend who never upgraded it past iOS 8.3. He was just fed up with Apple screwing the updates, and asked for an official unlock from his carrier. I used it for a few days, but for some reason, it refused to connect to my calendars nor sync to iTunes, saying it wasn't configured, except it was. Since there was no irreplaceable data on it, I wanted to do a full reset, and used the Settings menu to do that. Except, it didn't go as expected, and the phone stood stuck on the Apple logo while happily draining the battery. Then Genius Bar. Phone restored using their own "floaters". Now iOS 9.2.1. Other problems now: calendars synchronize properly, but movie tickets I had in Passbook aren't transfered to Wallet, IMAP-based notes I have been keeping on the two Macs, previous iPhone and iPad aren't displayed; toggle is activated, but nada: notes counter desperately show 0. I didn't even have the chance to perform an OTA upgrade to 9.2.1, which is said to be the correct way of keeping Snow Leopard sync-ability. Except that iOS 9.2.1 can't sync with iTunes 11.4. It needs 12, which in turns requires OS X 10.8 at least. After reading this topic on a French forum, I come here for some advice: if my friend has a proper Time Machine backup from mid-2015 and if he backed up the iPhone to his computer, if he ever performed the upgrade using iTunes, would it be possible to restore, first iTunes media folder, then one of his phone backups, along with iOS 8.3? Would such a backup contain the signed .ipsw unique to this iPhone?