HT201413 My iphone shut down, I started the restore process as detailed by various other users.  However the Iphone shuts down while restoring and when it switches back on I get message from Itunes with error 21.  I now can't access the Iphone at all.

My Iphone started shutting down and switching back on by itself. After researching problem, lots of results pointed towards restoring phone.  I commenced the process and all was going well until the phone shut down during the restore and Itunes then flagged up an error 21 code.  I now am stuck as the phone is in restore mode but I can't stop it switching off during the process.

iTunes error code 21 is a security software conflict and the recommended knowledge base article for troubleshooting is:  http://support.apple.com/kb/TS3125  Check through that and see if it helps.  If nothing works you may need to visit the Apple genius bar and have one of those people help clear it.

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