I am trying to upgrade to iOS 6.1, but iTunes is not allowing me to upgrade. I have an iPhone 5, which has been running 6.0.2. iTunes extracts the software and then tries to verify my iPhone with Apple. I then get an error saying "The iPhone 'xxxx' could not be updated. This device isn't eligible for the requested build". What do I do here. I have not tried an OTA update and would rather not.