Flash Back MB BIOs/UEFI Instructions - Asus Z170 Pro Gaming

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DeNoRainbow

Commendable
Jun 20, 2016
22
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1,510
After doing a clean install of Windows 7 and updating the BIOS to v1805 from v1105 (I think) I ran into a problem where my computer doesn't seem to detect the Optical 5.1 output.

Is there a way to downgrade the version of the Asus Z170 Pro Gaming BIOS?

I have tried EZ Flash 3 and the Asus DOS utility. Both tell me that I can't flash an older version of the BIOS and flashing the current BIOS again doesn't solve the problem.

Are there any other ways to allow my BIOS to be flashed using an older version of the BIOS?

Thanks for any advice!


Specs:
MB - Asus Z170 Pro Gaming
BIOS - v1805
CPU - Intel i5 6600K
RAM - Kingston 8GB
GPU - Nvidia GTX 670
 
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
6,113
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41,960
Can I just tell you something.
If you flashed the motherboard with a new bios firmware revision.

And after the flash the optical 5.1 output stopped working.

It is because to flush what we call dirty cache, or old bios code out of the bios chip to complete full programming of the new firmware.

You have to manually reset the motherboard bios via the jumper pins on the motherboard back to factory defaults.
Once you do this providing you have used the correct bios firmware for the exact model of motherboard you have.

You will regain use of the optical 5.1 output.
 
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DeNoRainbow

Commendable
Jun 20, 2016
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1,510


Okay I just did that then and I still do not have the Optical 5.1 output device.
Should I clear it then re-flash?
 
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Darkblocus

Commendable
Jul 6, 2016
6
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1,510
HI DeNoRainbow, i upgraded the bios to that 1805 (wich appears to be the latest one unfortunately X( ) and now my pc reboots randomly. I tried to downgrade the bios to an older version or reflashing it but encoutered the same messages as you. Did you find any solution ?
 
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Darkblocus

Commendable
Jul 6, 2016
6
0
1,510


Could you show me how to do that : "You have to manually reset the motherboard bios via the jumper pins on the motherboard back to factory defaults" ? if taht's what called cmos clear or RTC clear, i did it and my problem couldn't be solved.
 
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Nyprez

Reputable
May 26, 2015
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4,530




How did it go?
 
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