Asus M2N-MX - Manual (Page 46)

2- Chapter 2: BIOS setup
Updating the BIOS through a BIOS file
To update the BIOS through a BIOS file:
1. Launch the ASUS Update utility from the Windows ® desktop by
clicking Start > Programs > ASUS > ASUSUpdate > ASUSUpdate. The
ASUS Update main window appears.
2. Select Update BIOS from a file
option from the drop-down menu,
then click Next.
3. Locate the BIOS file from the
Open window, then click Open.
4. Follow the screen instructions to
complete the update process.