Note that the keys uses by Microsoft for signing Windows are different from the ones they use to sign anything else, and some motherboards and laptops only come

Note that the keys uses by Microsoft for signing Windows are different from the ones they use to sign anything else, and some motherboards and laptops only come with the former. Early x86 Surface Pros, for example (even though you could disable secure boot entirely, and be forced to go through Scary Boot Prompts).