Even though it's a Hughes box, they might be using other codes (in the cable box industry, for example, it's common for boxes to use a standard set of codes in one market even with several different manufacturers' boxes because it simplifies keeping remotes stocked). Unless someone around here with a 970, 990, or 1070 and an H20 can offer a specific code that worked for them, I'd look for some other common codes (ones that appear for more than one manufacturer) and try them as well.