Secure Boot Control is greyed

Hi everybody,

I'm trying to upgrade my Area-51 R5 from Windows 10 to 11 but I'm currently stucked with the TPM 2.0 issue.

The solution given in another post is "Enable "Secure Boot Control" under Boot section - which will then disable "Load Legacy OPROM" and then it will allow you to Enable "Firmware TPM"."

My problem is "Secure boot control" is greyed and i can't change it.

Any idea?

Thanks