Jailbroken iPhone 4s wont upgrade to iOS 5.1

so iphone 4s jailbroken , want update 5.1. dont care if removes jailbreak. i've been trying update every time get, "this device isn't eligible requested build." i've tried putting iphone dfu mode , restoring still doesn't work.
oh , i've tried update straight phone receive following message:" error occurred downloading ios 5.1."
know do?

 

i used on 5.0.1 decided upgrade 5.1, installed itunes 10.6 plugged phone in , did restore, updated new software. no problems here.

 

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