Was getting update unavailable messages when trying to update wirelessly from phone. Connected to iTunes, updated iTunes, downloaded update through iTunes, and in the middle of the update, it turned my phone off. Phone was off for a good 5 mins while iTunes said "waiting for iphone", then it gave me an unknown error. When I hold in the power button, the phone turns on in recovery mode, and when I connect to iTunes and attempt to recover, it turns the phone off again (rather than restarting, the phone is just turning off), then after 5 mins of "waiting for iphone" it errors out (error 4005). I've tried trying to turn the phone back on while it's "waiting for iphone" and that hasn't worked either. Awesome.