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Firmware will completely clean out all your customer settings, so you'll usually find your TV set needs set up just like you just bought it. If you use the TV's tuner, you have to autoprogram that part, then set up the video inputs if you're using those. It needs to know if you're using HDMI 1 or 2 etc by turning on those devices so it can see the signal coming from those devices.
I'll open it up for other Techs to suggest options.