You should only do Firmware updates when absolutely necessary. Software updates are not a problem. Firmware dictates what happens before the software loads.
Contact Wansa and ask them for a new set or a new mainboard. If it is a
software update that went wrong, there is help here. Firmware and software are not the same and the words are interchangeable.
https://www.google.com/search?q=Wansa+television+stopped+responding+after+firmware+update
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