I think you need to type this....AFUDOS.EXE /IP20B550.ROM You need the "I" to program the eeprom... If this still doesnt work, I will look further....good luck If you are using a Vista mod, it is likely 2.0 anyway...be sure the mod is with 2.1 SLIC
Thanks 911medic, The bios was *.bin format, but AMI bios. so I tried with option "/I" from usb dos AFUDOS.EXE /IP20B550.ROM, or AFUDOS.EXE /IP20B550.BIN but it say that it can't erase eeprom. I think the winflash.exe which included in original bios is different original asus winflash, and might have limit to flash. could you look further? Thanks in advance