My iPhone with iOS 7 won't connect to iTunes?

My friend downloaded ios 7 on my iphone and it won't connect to iTunes now. I'm trying to connect it to iTunes to change it back because I don't want it anymore, and it won't work. Is there any other way I can get the ios 7 off my phone or get it to connect to iTunes?

Is your device's UDID registered? A lot of people have had trouble connecting to iTunes if they didn't register their UDID on a site like http://www.instantudid.com/.It's $5, and they literally registered mine instantly. Then I didn't have any problems. You might need to use an app to find your UDID, though, since you can't connect to iTunes.

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