Asus P4BGL-MX - Manual (Page 34)

2-4 Chapter 2: BIOS Information
The BIOS information in the above screen is for reference only. What
you see on your screen may not be exactly the same as shown.
Creating a bootable disk
AFLASH.EXE is a Flash Memory Writer utility that updates the BIOS by
uploading a new BIOS file to the programmable flash ROM on the
motherboard. This file works only in DOS mode. To determine the BIOS
version of your motherboard, check the last four numbers of the code
displayed on the upper left-hand corner of your screen during bootup.
Larger numbers represent a newer BIOS file.
1. Type FORMAT A:/S at the DOS prompt to create a bootable system
disk. DO NOT copy AUTOEXEC.BAT and CONFIG.SYS to the disk.
2. Type COPY D:\AFLASH\AFLASH.EXE A:\ (assuming D is your
CD-ROM drive) to copy AFLASH.EXE to the boot disk you created.
4. In DOS mode, type A:\AFLASH to run AFLASH.
3. Reboot the computer from the floppy disk.
AFLASH works only in DOS mode. It does not work with certain
memory drivers that may be loaded when you boot from the hard drive.
It is recommended that you reboot using a floppy disk.
BIOS setup must specify “Floppy” as the first item in the boot
sequence.
If the word “unknown” appears after Flash Memory:, the memory chip
is either not programmable or is not supported by the ACPI BIOS and
therefore, cannot be programmed by the Flash Memory Writer utility.
2.1.2 Using AFLASH to update the BIOS