Downgrading ASUS Notebook BIOS

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.

asus a43sv

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.
windows run

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.
windows run asus winflash

How to run WinFlash via command line

  • The WinFlash window will be opened. Click OK
asus winflash from command line

WinFlash window opened via command line

asus winflash choose bios file

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.
asus winflash warning old BIOS

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

  1. verey good thanx

  2. I got this message 🙁
    cannot find the bios file: /NODATA
    could you please help me about it

  3. surprised-duncan

    Holy shit. Thank you sooooooo much. I have been trying to fix this for at least 5 months now and I have tried everything. EVERYTHING. Eventually I was lead to the BIOS update but it wouldn’t work because of WinFlash being ridiculous. This was so helpful.

  4. What version Winflash are you running. Winflash 3.01 doesnt seem to get fooled

  5. Man. Thank you. You save my life 😀

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