Have you been able to get back to your VU+ Duo?
If you haven't got your receiver, attached to your router, so it's not on the network, then you can't do a lot of the things, I've suggested.
One thing you can do, is switch off your receiver, disconnect the LNB from Tuner A, and attach it to Tuner B, then try scanning in the channels.
From other posts, on the internet, the VU+ Duo is capable of receiving HD channels, but people have experienced problems, scanning some channels in, and had to resort to using a prepared channel list.
I wish I had access, to your receiver, to confirm that nothing works, thus narrowing down the problem to a hardware/software issue, or that someone near you could thoroughly test it, providing they knew what they were doing, as Enigma 2 receivers are not just basic plug and play receivers.
Good luck, and did you buy that other receiver?