They only included drivers for it with the software for HR44/HR54. It is easy to guess why doesn't work for the H2x/HR2x, they consider those effectively obsolete (and might not have a lot of room in the firmware for adding drivers for something few would use)
The big question in my mind is why not make it work with the HS17? The original "inside" information we got on the LCC before it was released said it would be supported with the HS27. Obviously there's never been an HS27, but there's no reason it couldn't be made to work with the HS17 if they wanted it, unless its USB port is not fully functional for some reason.