Hyper, I've been stalking Asus FTP site recently
, there are alot of change/revisions even at their DOS based AFUDOS flashing utility.
Again, if you watch closely when using Win based flash or even the built-in Bios EZ-flash, they did skip some region of the boot block. For Windows version I dunno, but for EZ-Flash, they can't overwrite themself (the flash routine).
The only method to have a clean total BIOS refresh is still booting from DOS and thru AFUDOS
on stock speed. I dedicated bought a 256MB usb thumb stick, made it DOS bootable and put all Bios revisions, AFUDOS and Memtest, and plug & forget it at the rear of the puter. When times to flash, just press F8 during post and select boot to USB and do everything from there.
Well, lesson learned especially with these new P5B-Dlx board that has new flash type, heck it doesn't even have a flash chip if you watch closely at the mobo, dunno where they put it.
This is sux and feel sorry for you, I hope you still can find another way out to fix this.