Hi Mikeyboy. You can try this with your original main board installed to flash the firmware. Download this file and unpack the bin files and txt file to the root of a FAT filesystem usb stick.
With the TV unplugged, put the usb stick in the top usb port. Hold OK on the remote while pointing at the TV and plug in power. Wait a while and hopefully the TV will boot up with new software. Problem is it might not be the exact right software for your TV, which is the problem I'm having - the TV tuner still doesn't work. It at least might get you somewhere anyway.
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