mokutil and these commands don't work without UEFI:

  mokutil --sb-state
  mokutil --help
  mokutil --import key.der
  mokutil --list-new
  reboot

  efibootmgr
  efivar

  fwupd
  fwupdtool
  fwupdmgr get-updates && \
  fwupdmgr update

  tree /sys/firmware/efi

  systemctl reboot --firmware-setup