@MeNaCeNZ thanks for the reply, much appreciated. I've raised a ticket with One, will see if I have any luck there. Maybe at least I can return them. Otherwise may end up going a similar route to you...

@MeNaCeNZ did you figure out a solution to this one? I just received some One X50 units and didn't realise they came with ISP firmware. Looks like they're at least missing VPN server and IOT wifi...