Just bought a Linksys WRT3200ACM on Ebay and when booted I see screens for ExpressVPN Router. Even as a noob, I assume this is custom firmware that was sold preinstalled on this router by this ExpressVPN company? The system status page shows OpenWRT Chaos Calmer 15.05.1 r49389/LuCl for-15.05 branch (git-16.206.66468-6f5c486), whatever all that means.
In any event, I'd like to update it to the latest 18.06 release and use it with my own VPN provider (Private Internet Access). I'm also looking forward to trying WIreguard as soon as PIA supports it, and other stuff like VLAN and Policy Based Routing. So finally the question: Can I just download the correct v18.06.4 image for this router and flash it from within the existing ExpressVPN Router firmware? It has a utility for this on System tab. Or, do I need to do something more geeky and do some sort of factory reset and wipe out the existing OpenWRT firmware? Thanks....