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In your case you already went out of family by going UD02 to UD04 so we have to allow you to go out of family to get back. I think you will be fine. Again I tested on my UD02 (how I got the firmware) and flashed it to UD04 fine and back again. Not sure why your original flash to UD04 didnt work but not sure what that software does so. All i know is that a good UD04 flash can be flashed back to UD02. So I think we have hope, if your flashes were done well in first place.
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