I have no idea of how else to help....did you try flashing your bios with your non-modified bios version with this DISKFLASH Utility?
i try with non-modified bios with .bup ext and it worked. i try with non-modified bios with .rom ext ant it didnt work. error message : invalid flashint.bin. i try with phlash dos utilitiy. is same thing with DISKFLASH utility? Thanks for ur effort.