I recently acquired a nearly brand-new XPR5550. When I try to read it with the MOTOTRBO CPS, it won't see the radio, and gives me an error message stating so. In fact, my PC won't even show that the USB port I have the radio connected to is even in use. I've tried this on two different PCs I have, and I get the same result. I recently used the same programming cable to program an XTL I had, so the cable shouldn't be the issue. Am I missing something?