No olviden que si quieren *habilitar* el secure boot tambien deben entrar en la opcion de "Key management" y seleccionar la primera opcion para cambiar de Platform mode "setup" -> "user"
Can this tutorial applicable for dual boot from windows 10 to windows 7? Because i tired many tutorials on how to dual boot from external hard drive with OS Windows 7 but it did not add additional bootable device..