How to solve Unable to restore Unknown Error (47)?

I'm at my wit's end now. Happened after upgrade to iOS 4.2.1. Initially I couldn't complete my restore,and the bar froze. Then after leaving it overnight, and I saw that it was still frozen there, I disconnected the phone. For hours I've been trying to restore my iphone but all I keep getting now is an error 47. Tried restoring from another computer, removing itunes, installing the latest version, but still nothing.
Please help. Thanks..

This is most likely a hardware failure, most likely the dock connector, though it could be a problem caused by an attempt to hack or jailbreak it.  You can try the suggestions here: http://support.apple.com/kb/TS3694#error28

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