HT4623: Update your iPhone, iPad, or iPod touchLearn about Update your iPhone, iPad, or iPod touch
Currently Being ModeratedOct 7, 2012 12:47 PM (in response to sheenadawn101)
plug it into the computer
if it's not being recognized on one usb port, try another. if you're using a desktop computer, use a usb port in the back. try all of them. seriously.
if it's still not being recognized, plug the phone into the computer again, then:
hold the home button and the sleep/wake button on top simultaneously until the screen goes black. at that very moment, remove your finger from the sleep/wake button, but continue holding down the home button until you see a message in itunes that says 'itunes has detected an iphone in recovery mode.' then release the home button and restore your phone through itunes