BTW if someone wants to ATTEMPT cross flashing a B2 with a B3 bios (or a B3 with a B2 bios)
You have to use an SPIflash with ID check disabled.
You can try
http://www.mediafire.com/?ztnl3xlwjwd
or
http://g0rbi.000space.com/index.php?id=11
No idea if either version of spiflash is compatible even with a NON crossflashing, but the one on g0rbi should be newer. YMMV.
Pretty sure going from B2 to B3 would work, as long as the B2 stepping info is still there.
B3 to B2 is choose your own adventure land, since the B3 stepping info isn't in a B2 bios, so that's YMMV. And I take NO responsibility for your computer blowing up if it doesn't work. And make sure you have Leegolfd's emergency backup bios invoke method available.
This would be a great experiment for someone about to RMA their board...