My phone will not come on,when i try to restore the phone it says the iphone could not be restored unknown error occured 21 someone please help!!

can some one help me with this ? i tried to do hard reset no luck, when i try to restore the iphone it says unknown error 21

Yeah i getting the same error on my iphone3gs. Ive tried eveything i think if you find something out PLEASE let me know. Im going to send mine in though bc i cant take going with out a phone anymore. GOOD LUCK!!!!!

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