Оригинальный сообщение: Ben ,
Have a feeling firmware on phone is corrupt. Plug the phone to computer while holding home button. Keep holding home button until it shows the iTunes recovery mode logo. Try update through iTunes. If error -27 is displayed I'm afraid you will need to restore the iPhone and lose all data. Phone will kick out of recovery mode after 5 minutes so if the download takes too long put the phone into recovery mode again.