Hi to all. I'm new here. I bought an asus ac 86u and straight out of the box I have the system version 3.0.0.4_386.447 .. I don't have much technical knowledge and I want to set up a vpn connection with two or three of my receivers, such as tv or tv box, using a cable. I know that to do this, I need a Merlin firmware upgrade. Can I directly upgrade to a newer version or do I need to install some older versions first