How can I recover Main BIOS from Backup BIOS on Z390 Aorus Master?

[NDRE28]

Hello! 

 

My motherboard is Gigabyte Z390 Aorus Master. 

 

I've updated the main BIOS from F11n to F11. 

Everything was fine and was able to boot into Windows. 

 

Later I've observed that Secure Boot was disabled and I could not enable it (as required by Win11). 

It gave me the following message: 

"Secure Boot can be enabled when Platform is in User Mode. Repeat operation after enrolling Platform Key (PK)". 

 

So I took the following steps: 

Key ManagementPlatform Key (PK) Update / Yes / "Success". 

After that I was able to set Secure Boot Enable as <Enabled> 

 

After restart, the PC went dark! It would not boot either into Windows or BIOS menu. 

 

I switched the BIOS button to the backup position and the PC booted normally. Now I run my PC on the backup BIOS. 

 

QUESTION: 

How can I recover the main BIOS from the backup BIOS?

 

*Resetting the CMOS didn’t restore the functionality of the main BIOS. 

 

 

*Holding CMOS Reset + Power On buttons for 10 seconds, then power on PC - Did not solve the issue. 

 

 

[whispous]

Please don't make your text huge.