You should have a flash utility that will do it for you. Nomally found on the mobo CDROM or you can download it from Asus. The other way is to flash from a floppy and here are the instructions:
- Download the latest 1014 BIOS and BIOS flash tool here:
http://support.asus.com/download/download.aspx?Type=All&model=A8N-SLI Deluxe
- Download the BIOS and flash tool under the BIOS section of above mentioned URL.
- In Windows XP go to the floppy drive
- Format the floppy using the option to create a MSDOS startup disk
- Once the disk is created unpack the 1014 BIOS and flash tool to the floppy
- Hit ‘del’ once the system displays the boot screen
- Go to ‘Exit’ menu and select ‘Load Setup Default’
- Then ‘Exit & Save Changes’
- After the reboot the system will boot off the floppy
- Type ‘awdflash a8nsd014.bin’ to start the BIOS update
- Select ‘No’ to save BIOS and ‘Yes’ to update BIOS
- Once completed press ‘F1’ to reset the system
The Asus tool is easier and does a good job. I unzip the new BIOS to a floppy and tell the tool to look for the new BIOS file on the floppy