HT4972 How could i solve restore iphone 4s to ios 5.1.1 and get error 1?????

I tried upgrade my iphone 4s to ios 5.1.1. At the end of restoring iphone firmware, it displayed : The iphone " iphone" could not be restored. An unknown error occurred (error 1 ). I tried for times . It is very stange to me to upgrade my iphone 4s, I am finding no solution to its.
anybody help!!!!!!

Error 1 usually means there is a hardware failure on the phone.  See this:
http://support.apple.com/kb/TS3694#error1

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