QUOTE
BIOS that I got from the "usual place" called 4891.67_bfm_fixed
DO NOT flash a BFM(Boot from Media) bios to your chip. I've never had to use them, but I believe those are for booting from CD, or loading a temporary BIOS to memory. Use the standard 4891.67 edited with XBTool(or m8, as posted).
DSLTech_Dude