iPhone 4 stuck in recovery.
Hi all. I am trying to fix a coworkers iphone. It is stuck in recovery. I thought I might be able to do so using my iTunes account. It downloads the software and then extracts it. And then I get this message. The iPhone "iPhone" could not be restored. An unknown error occurred (21). I believe the phone screwed up after downloading an iOS 7 update. Does anyone have any ideas on how to get it working again? Do I have to use her iTunes account on her PC? I also wonder if I can get it working by jail breaking it? Thanks in advance for any help.
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