Hi all. I'm trying to update a jail broken iPad from iOS 6.1.2 to iOS 8. The jailbreak has apparently disabled the software update on the iPad itself. In iTunes, it says that 6.1.2 is the latest software, which is obviously wrong. I have tried downloading the correct iOS 8 firmware and shift+click to restore that ipsw; this doesn't work (error ex08000004). I have tried a plain restore in iTunes in recovery mode. This doesn't work either. It goes through the motions of downloading iOS 8, then the process just stops after the unpacking process, without any error. No changes are apparently made to the iPad. Essentially it seems update proof. I'm completely stuck. Any advice very welcome!