How do you reset your iphone 4 after it was unplugged during an update

So i got my iphone 4 yesterday and i was hooking it up to a computer for the first time, an update was availablle so i continued with the update, during this time i walked away for a few moments and came back to the laptop hibernating and a frozen iphone with a 0% loaded apple screen, ater this i tried restoring it 5 or 6 times but it just sends up an error message. How can i restore my phone????

i turned it off and back on and now it is giving me error message 21 after a failed update

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