ASUS P4S800-MX User Manual

The ASUS EZ Flash feature allows you to easily update the BIOS without having to
go through the long process of booting from a floppy disk and using a DOS-based
utility. The EZ Flash is built-in the BIOS LPC chip so it is accessible by simply
pressing <Alt> + <F2> during the Power-On Self Tests (POST).

1. Visit the ASUS website (www.asus.com) to download the latest BIOS file for

your motherboard and rename it to P4S800MX.BIN. Save the BIOS file to a
floppy disk.

2. Reboot the system.

3. To launch EZ Flash, press <Alt> + <F2> during POST to display the following.

If there is no floppy disk found in the drive, the error message “Floppy not
found!” appears.

If the correct BIOS file is not found in the floppy disk, the error message
“P4S800MX.BIN not found!”

4. Insert the floppy disk that contains the BIOS file. If the P4S800MX.BIN file is

found in the floppy disk, EZ Flash performs the BIOS update process and
automatically reboots the system when done.

DO NOT shutdown or reset the system while updating the BIOS! Doing so may
cause system boot failure!