HT201210 iPhone 5 could not be restoring the software

When I ON my iphone 5 its asking to connect iTunes, if I connect the iTunes from my laptop its saying 'iPhone need to be restore' and asking to download sofware & preparing to restore but after in a while I am getting a massage 'could not be restored'. error occurred (21)..... Please help me????
here is the link:
http://support.apple.com/kb/TS1275?locale=en_GB
error occurred (21) link:
http://support.apple.com/kb/TS3125

Try freeing up more disk space on the computer.
Next
Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased.
If recovery mode does not work try DFU mode.                        
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings        

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