* Try another T.V. that is capable of properly detecting 720p.
** Try to find original firmware and re-install.
*** Dangerous ***
Boot up China Box, wait 2 minutes. Pull HDMI cable and attach again. This may force auto-detect/handshake of your devices. Then change to a better resolution...1080p???
This is a very risky process, which, may damage you China Box or T.V. (I've seen boxes die this way)

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