Dish can likely "see" if a receiver has the dual-tuner OTA dongle and if not, the latest s/w simply isn't made available to it. One post indicated that U235 was only for adding dual-tuner support. I doubt that's 100% accurate but if there are other changes/updates, they're likely very minor and not critical, hence no widespread rollout by Dish.I don't have the dual OTA tuner so no big deal for me, just surprised.