I need to flash my router Asus RT-AC87U with the Merlin Firmware To use some features that the stock firmware does not have and i have a couple of questions? First can i backup then restore my VPN settings from the factory firmware to the new Merlin? Second is when i go to the Download page and open the folder for that router it shows at the bottom version 380.65 i guess that is the newest but there are 3 zip files 380.65-0, 380.65-2 , 380.65-4 ? which one do i use???