Hmm. Guess that shows me for assuming the reasonable explanation rather than the impossible one. Yeah, you can't do that, nor is there any reason to. There's no functional difference between the two aside for support for 80's added hardware, which naturally the 30 doesn't have. The only way to load firmware is through the Zune software, and that will only give you the appropriate version. No other version would work even if it could be loaded.
Solved and locked.