AgentX20 When performing a BIOS downgrade please make sure that ALL blocks are programmed(downgraded). It is advisable that you use a DOS bootable flash drive and add additional parameters to the flash utility for the missing blocks.
This is how they appear in the windows utility(for AMI Bios):
This is a tutorial for ASUS motherboards containing a link to the files needed on the usb drive. By opening "Autoexec.bat" in notepad, you will find "afudos.exe bios.rom /GAN" command where "/GAN" is the default argument to program the whole bios. Replace "/GAN" with "/p /b /n /e /l /k /R" where "/p" = main bios , "/b" = boot block, "/n" = nvram, "/e" = EC block, "/l" = all rom holes, "/k"= non critical blocks and "/R" = preserve ALL SMBIOS structure during programming. I suspect that the values that affect strain are not in the main bios block. Add "/x" to not check rom id. If some blocks are missing it might give an error and skip the entire process. You have to delete the specific parameter and restart.
A properly reflashed machine will reboot two times.
To boot the flash drive you may need to enable legacy boot of storage devices in bios.
Always make a backup of your current bios!