Yes, have done the firmware update. Probably pointless to use 3.0 until they refine the technical side a bit more. I know a defective tuner when I see one and this Sony unit has a bad tuner.Have you gone into the menus, and tried doing a new Firmware Download, to check for new firmware? If not, get used to it, because ATSC 3.0 is still basically experimental, and they keep changing stuff.
Noted that a Ch. 45 around 50 miles from here comes in fine on my LG while the Sony can't really pick it up. As a result I purchased an Insignia 43 inch for my second room and as luck would have it, I accidentally broke the screen on a piece of wood. Still somewhat usable but for about 4 inches of the entire left part of the screen, it is useless and also a couple of lines run east west. My previous two attempts to use Insignia TV's didn't end well either. The last one I had a few years ago, I dropped and broke. Can't return something I broke myself. LOL. Have to eat the cost.
Will return the Sony and probably get another LG. Noted something called Nano Cell Technology for the picture of some of the mid grade models. Might be a pretty good picture and comparable to the Sony but minus ATSC 3.0. Clearly I should not own a Sony or Insignia TV since my track record with both companies TV's has been terrible. Similar issues with Samsung. For some reason the two LG's I've owned have not been defective nor have I destroyed them by being a klutz. I am willing to trade a bit of the picture quality for something that is more logical to operate and is not buggy. Most of the viewing I do (which isn't that much really) is comprised of older TV shows from the 50's through 80's and then some sports like Football, Hockey, Ice Skating, Tennis and Golf. Finding a TV with some motion enhancement will help on that. The Insignia has a good picture but is a bit rough with fast moving frames since it does not have motion enhancement technology. But bear in mind I am only shopping for a second TV to back up the other LG which is fine and I don't need to spend a lot of money on some features or technology I will never use. Just basic OTA viewing here.