Comment: Look at the FCC ID. (Score 1) 148
At least you were lucky enough to catch it in time. If you look at the FCC ID of units from both revisions, you'll see the RX-51X that I'm talking about.
The other sure way to tell is if you have to use Pali's bootloader in the place of the bootloader used to load Nemo(Meego) or Android(GB/ICS if you want a strict tablet w/o non-VOIP data services)