As I mentioned on my previous post about high CPU usage by audiodg.exe, I highly suspected that the culprit is because I upgrade my ASUS Notebook BIOS. So, here I’ll show you how to downgrade your Asus Notebook BIOS.
Asus Notebook has two way of upgrading/downgrading your BIOS. One way is using EasyFlash via BIOS boot screen and another way is using WinFlash utility. I’ll use WinFlash in this tips. Why? Because I can’t take BIOS boot menu screenshot 
WinFlash can be found on your Notebook CD driver companion or from Notebook Asus driver download page.
Normally, WinFlash would not let you downgrade your BIOS. You’ll get warning and can’t click on “Flash” button. So, we need “unusual” way to start WinFlash utility
- Make sure your Notebook battery is fully charged or connected to powerline.
- Open Windows “Run” window by invoking Win+R. Type cmd there. It will open Windows command prompt.
run cmd
- “cd” to where you install WinFlash utility, usually on “C:\Program Files (x86)\ASUS\WinFlash“
- type this command: WinFlash.exe /nodate
- See this screenshot for all above commands.
How to run WinFlash via command line
- The WinFlash window will be opened. Click OK
WinFlash window opened via command line
- Choose your BIOS file. (BIOS file can be downloaded from Asus driver download page)
Choose downloaded BIOS file
- You’ll still get warning about the BIOS you want to Flash is older than the currently installed. But, now you can click on “Flash” button.
warning from WinFlash
- Now click on “Flash” button. Flashing will start. After that, you can click on “Exit”. Windows will shutdown automatically.
There you have successfully downgraded your Asus Notebook BIOS!
Tested on: Windows 7 64bit, Notebook Asus A43SV, BIOS Revision 317 downgrading to Revision 314
