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Problem: Some of BIOS settings are grayed out and you can't change them. Or, you cannot enable/disable secure boot.
Solution: In my case, I had to set up a supervisor (admin) password for the BIOS. What I needed to do was the following set of steps:
1. When the system reboots, it SHOULD give you the option to log in to the BIOS as a guest or registered user. Log in as GUEST into the BIOS instead of a registered user (wiered, but it works).
2. Go to BIOS Security settings and create a BIOS admin password.
3. You should then be able to change grayed out options as they become available.
Reason: This situation occured for me when I logged in to the BIOS as regular user. I needed to log-in as an admin(supervisor).