OptiPlex 790 (April 2011) has a UEFI BIOS but without Secure Boot it is a "legacy/early" UEFI. JOcean is correct.  list of Windows 11 Supported Intel Processor 790 has 2nd gen intel cpu.
As windows 11 is coming and it requires secure boot to be enabled I have a Dell optiplex 790 on bios revision a13 and it doesn't support secure boot so I wanted to know if I update the bios to the a21 revision (latest version) will it add secure boot support Ps: I already have the minimum hardware specs I'm running on a gpt uefi drive and have tpm enabled
Dell optiplex 790 secure boot