ASUS Z170 Flash Back to Older BIOS How To

Credits for this guide go to elmor. Thanks for your work!

WARNING: This may cause your system not to start. Use at your own risk.

The procedure below allows you to flash an older BIOS on motherboards without USB BIOS Flashback feature. The lack of this feature means there’s no simple way to recover if things go wrong.

This will help to solve the error “selected file is not a proper BIOS”.

If you want to use non-K OC with recent ASUS boards, you often can’t flash back to an older BIOS the normal way. So you have to follow this guide to downgrade the BIOS.

 

First download the required tools here:

UEFITool v0.21.5
2.67 MB | 26439 downloads
Flash Programming Tool
2.79 MB | 79104 downloads

 

Prepare the BIOS file for use with FPT

  1. Get the BIOS for your motherboard in CAP format (in this case MAXIMUS-VIII-IMPACT-ASUS-0019.CAP)
  2. Open the CAP file in UEFITool
  3. Export to ROM (MAXIMUS-VIII-IMPACT-ASUS-0019.ROM)

uefi_tool1

 

uefi_tool2

Extract body

 

 

Using Flash Programming Tool to flash the BIOS on your system

  1. Open a command prompt with Administrator rights and navigate to your FPT directory (Note: There are DOS/EFI/Win32/Win64 versions, this guide uses the Win64 version.)
  2. Flash the BIOS by using the command fpt -bios -f BIOS_FILE.ROM

fpt

 

The BIOS is now flashed to the old version and you can do non-K OC 🙂

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