This forum post has more information but basically the 3450 does not have UEFI or Secure Boot options.
Hello. I Can't find secure boot options in Phoenix securecore Tiano, I a DELL Vostro 3450. I need to boot from USB but I think that secure boot is enabled and don't let me do that. The option to disable it isn't visible. Please help me. Thanks.
Can't find secure boot options in Phoenix securecore Tiano - Vostro 3450