Sound problems with TCL TV

Hi, i am from Argentina, I am being using plex for almost 10 years i guess, I bought a new TV TCL 50P8M Andorid TV a week ago, same audio problem, no voices in AC3, just background audio and music, very disapponted. I cannot find a firmware upgrade yet.
Any idea where I can find it? THANKS A LOT
Facundo.

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