Secure boot doesn't appear

I have a Gigabyte h81 motherboard. Because of the secure boot requirement from battlefield 6, I decided to enable it. I changed the disk to gpt and changed everything in the bios to uefi, but there is no secure boot and the pc doesn't start either (even after changing it back) I hope that I won't need to update my motherboard to enable secure boot, as there will be a lot of changes to make. As for starting the system, I've heard that it can be solved by removing the battery from the motherboard.