So I have the iPad 3rd generation 16GB Wifi and it runs on iOS 5.1. I have NEVER jailbroken this device and when I try to update it I get the error "This device isn't eligible for requested build." I heard that this usually happens to jailbroken devices but mine isn't even jailbroken. Is there any way I can fix it? I tried to restore my iPad through iTunes but it won't allow me to do that either.