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What tyoe of upgrade was this and on what type of device? On most TV sets, you have to do more than one channel scan to get all digital channels. They are very sensitive to ariel postition and, if the signal is not seen when it does the scan - it's all or nothing. You should be able to do additional scans without deleting the previously discovered channels. I don't know what model TV you have so that;'s as specific as I can be at the moment.