Trying to upgrade from 4.2.10 to 5.1.1. Error message -37 says backup will result in loss of all contents on the phone.

I need to upgrade from version 4.2.10 to 5.1.1. When I try, I get the following error message: An error occurred while backing up this iPhone (-37). Would you like to continue to update this iPhone? Continuing will result in the loss of all contents on this iPhone.
How can I upgrade?

This writeup says you have a security issue. http://support.apple.com/kb/TS3694
Try following the troubleshooting steps under error 37.
Good luck.

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