Unable to restore my iphone!

Hi guys!
Today I downloaded from itunes the last available software, but iphone didn't install it correctly and showed me an error according to which itunes suggested me to restore my iphone. Ok, I tried to, but while it makes the preparation to restore the phone, it shows "unknown error (21)" and aborts the operation! So, I don't know what to do - my phone only shows only an apple and nothing more!
Also I tried to restore it in DFU mode - neither it helps. I downloaded software apart, but when I try to chose it to restore, itunes doesn't allow me to chose a folder, neither the files inside it.
Do you have more ideas? I can't wait till monday for apple support shops to open ((((

The firmware on your phone is somehow corrupted. It either came out of the box that way or you tried to jailbreak it.
First, if you haven't already, install iTunes version 8 (http://www.apple.com/itunes/download/).
Next, plug the phone's USB cord into a USB port on the back of your computer (not a hub or a port on the front). Plug the other end of the cord into the phone (don't bother with the dock at this time). iTunes should launch and restore your phone. Give it up to 5 minutes to recognize the phone (it usually takes a minute), and 15 minutes to an hour to restore, depending on your Internet connection speed. DO NOT TOUCH THE PHONE UNTIL THE RESTORE IS COMPLETE OR YOU GET AN ERROR MESSAGE. Ignore any displays on the phone during this process, including an icon that says to plug it in. It's already plugged in.
If it doesn't recognize the phone after 5 minutes go to plan B. Disconnect the phone, press and hold the HOME button, and while holding it, connect to the cord AND CONTINUE HOLDING. After about 1 minute the phone should enter DFU mode and start restoring.
If this fails go to Plan C. Take it to an Apple store and ask them to fix it. Make a Genius Bar appointment first at http://www.apple.com/retail/storelist/. Look up your nearest store and there will be a link to make an appointment.

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