I'm afraid you have a useless brick, quite literally a doorstop; whatever you do, do NOT order option 39!! You can easily buy a used M7300/XG-75M with option 39 for between $150-$400 (approx). For reasons I cannot fathom, numerous people who know absolutely nothing about Harris radios purchased piles of 700/800 Open Sky & EDACS M & P 7xxx radios, and try sell them on Fleabay for hundreds of dollars; usually they don't show screenshots of the option codes, sometimes they will explicitly state they have no idea what options are included. Those are totally worthless bricks, they should only be bought/sold as parts radios for maybe $20-40.
There are numerous great sellers on Fleabay, they will always post screenshots of the features and option codes, and/or send you screenshots if you ask. You can also find good quality used Harris radios on several facebook groups. The bottom line is keep what you currently have for spare parts, and buy something with option 39 already included (and if you can find it Option 47 as well). Also beware there are a few idiots occasionally selling Harris radios on Fleabay that were improperly shipped from the factory with Option 47, but NOT option 39. Those radios are also useless bricks.