Graphics Driver Install : Windows 10 secure boot : How to disable?

windows 10 x64 pro, Asus z170p, BIOS version old. AMD graphics card.

As you all are facing, I am facing the beta graphics driver-secure boot problem after windows 10 anniversary update, seems like microsoft hates non-WHQL drivers and I can't properly install beta drivers in windows 10 anymore. So I need to disable secure boot. But I can not disable secure boot from BIOS, the option is grayed out in BIOS.

I even tried Windows->Settings Menu-> Update->Advance Startup->Troubleshoot->Restart-> UEFI FIRMWARE SETTINGS. The option is still grayed out. So I wonder how I can disable secure boot. Do I have to do anything with the Secure Boot Keys?

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