When try toupgrade to OS 5.1 downloads to itune ,but I get a message firmware file not conpatable

When try to upgrade to os 5.1 it downloads to itunes,but then i get a message "firmware file not compatable"????

Are you attempting to upgrade to the current version of iOS (5.1.1) or to 5.1? If you're not trying to update to the current version, it won't work. 5.1 is no longer signed.

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