HT201412 iPhone 4 in recovery mode

My iphone 4 is in recovery mode and i  don't know how to get it back working, every time I connect it to itunes a message comes up telling me that my computer has detected a iPhone in recovery mode, my only choice then is to let it update it and then to restore it but when i go to restore it, it comes up extracting iphone then an error comes up saying itunes cannot restore your iphone unknown error (21). I dont know what to do as I have tried everything like pressing the home and power button and all that. My iphone wont turn on unless charging and when it is charging all that comes up is a picture of a usb and itunes and i cannot do anything else with it, anybody any suggestions??

The only recommendation that we could make is to follow this support document about restoring, however if it will not restore after multiple attempts and does not return an error code, then I suggest making an appointment at the Genius Bar at Apple to have the device examined. http://support.apple.com/kb/HT1808

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