B3C7 won't flash in 800A?

All the B2x7 works, but I got the B3C7 so I can upgrade to 822, but it says “This Firmware version cannot be upgrade!”.

I select the right drive and everything. Do I need to be at a specific version first for the dual format firmware to work?

Thanks,
HEX

You need to pay $10 to upgrade to 822A, Try the BenQ website for upgrading details.
There are also websites and forums on hacks to upgarde to 822A.