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
do you have a flash lock in the bios or a jumper on the board for this..it sounds like bios flash protection...
no there isn't flash lock in bios setting, loaded default setting. I can see only password setting from there, it is common Toshiba laptop. and I can't find any jumper on this board.