As far as I can find, the latest software still does not have codes for the HR20. You may be able to use codes from other DTV DVR's if they work. I found under the "Files" section here codes in .CCF for the HR10-250. Perhaps that would work if you import the .CCF into the MX-900 editor through the Universal Browser.

[Link: remotecentral.com]

Other than that, you may have to learn the codes for now.

EDIT: There are codes...check out a few threads in the other URC forum. I think Mike from Surf Remote has some.