Can they not modify that BIOS code to not skip those pages? I'm sure anyone with enough knowledge to decompile a BIOS would have obviously thought of that idea

Can they not modify that BIOS code to not skip those pages? I'm sure anyone with enough knowledge to decompile a BIOS would have obviously thought of that idea though. I'm guessing the BIOS images are signed or something? Regardless, this smells evil to me...