Iphone will not respond after trying to put it into DFU mode while in recovery mode.

I tried to restore my iphone 4 and recieved error 21 in itunes, while in recovery mode I tried to put it into DFU mode and then it turned off and wont turn back on or be recognized by itunes or pc. I tried doing a hard reset and no luck. HELP PLEASE!!!!!

That does happen.  It depends on how hard the server is being hit, as well as the connection speed of your system.  If you are on a windows system, you will want to disable any antivirus or firewall software during the download.

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