I recommend to remove the firmware file (a combination of hardware & software) and place it into DFU Mode (device firmware update) and let it restore.
http://support.apple.com/kb/TS1813 skip step 2 since its not an iPod.
http://osxdaily.com/2010/06/24/iphone-dfu-mode-explained-and-how-to-enter-dfu-mo de-on-your-iphone/ how to place it in DFU Mode
If this doesn't fix the issue, it needs a repair/replacement.
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