Yeah dude, I have the exact same problem. I've burned 4 different BIOS CDs and my X2.3b Pro won't recognize any of them. I've tried 3 CD-Rs and 1 CD-RW (burned 4 different times), and NONE of them worked. I still haven't gotten my BIOS flashed yet. BTW I have a Samsung 616 PC drive in my Xbox and it reads ALL media I throw at it.