Dray, I'm finding my self disagreeing with you, apologies
It's not a computer, it doesn't have a bios (computers don't these days either), it's just a modem. At the moment, it does all it needs to do and it probably supports G.Vector too. I can't think of any additional features that are required.
Most computers do have a bios of some kind, A uefi, is just a nother way of saying it, if it can be updated its some kind of firmware or code that can be changed, (updated)
maybe if we had some extra features, we would not need to type as many guides, as we all seem to be doing, like a tick box, to make it send the UI over the wan port, not just that, but as mentioned before, by someone else, there are newer drivers in a different bit of hardware, which could be moved to the HF612, with the right know how ?