Sorry, @NineX if I am being slow… when you say “and go advanced and sign /boot with your key”, What exact option do you mean advanced?
So I go options, GPG Options? I see add GPG key to bios but not /boot?
Sorry 
Sorry, @NineX if I am being slow… when you say “and go advanced and sign /boot with your key”, What exact option do you mean advanced?
So I go options, GPG Options? I see add GPG key to bios but not /boot?
Sorry