I had the same problem with my TV (LE50FHDE3010). Using code 9735, would take me to the factory settings where I could toggle mirror control, but it always reverted upside down when I turned it off and on. I ended up calling TCL and they had me use code 1950 to get into the Design Mode Menu. Here I could turn Mirror Control off and on, but still the same issue when I power off/on the TV. They had me change the PROJECT_ID from 7 to 8 (which they said was default) and they fixed the issue for good.
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