ipad not restoring

Latest update, left it in DFU mode (screen off) on charge for 5 days, tried again. This time itunes saw it and tried to restore, unfortunately I get restore failed, it gets to the apple logo with a progress bar, but no further - any ideas? Its an error code 40, unknown error, I have updated itunes, checked security settings, unplugged as many other usb devises as I can, anything else I should do?
 
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