Can't restore my iphone after failed update.

I just updated my Iphone 4 to IOS 7.0.3, it worked for a few hours then put itself into recovery mode. I tried to restore it through iTunes, and it says that I have to restore and update my iPhone. I did that and now it is saying that it cannot restore my iphone due to error 21. I've changed USB ports, and even tried restoring it on another computer. But it is still stuck in recovery mode. And can't do anything, my Itunes is up to date, so is my computer. And i have no firewall up at the moment to stop it. How do i fix this?

http://lmgtfy.com/?q=iPhone+error+code+21

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    Update Server
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    Public DNS — Google Developers
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