HT201210 I'm trying to restore an IPhone 4 but keep getting an unknown error 27 message. What is this and how do I fix it?

My cousin asked me to help with his IPhone 4. It will not do anything except show the Apple logo. I have tried to do a restore on it but keep getting the message "Unknow error occurred. (27)". What is this and how do I fix it?

iOS: Unable to update or restore

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