Not eligible for the requested build
Trying to restore an ipod touch Gen4, tried everything, the usual checks have been carried out, latest version of iOS on my Mac, latest iTunes version, no USB conflicts, plugged directly into the Mac and yet every time I get the same message while trying to install the latest iOS for the iPod (currently running 4.3.1) - "The iPod "iPod Touch" could not be restored. This device isn't eligible for the requested build."
i checked online and the 4th Gen touch is eligible for iOS 6, but even if i could get it to 5 that would be fine. I know it works as we have other 4th gen iPods running iOS 6.
Help, please!!
iPod touch, iOS 4.3.1