i tried to update my iphone and itunes crashed on me during the update i waited a few seconds then my iphone turned of now every time i go to turn it on it turns on then goes into DFU mode for about 5 secs then restarts it self it keeps on doing that. then when i got it to stick i restored it with itunes and i keep getting a error message 2002. and nothing happens it just starts to turn of and turn on again