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LG OLED65CX - HDR broken after 03.23.35 FW update (solved)

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Edit: well, had to reset defaults, fixed after that. 

Hello. in recent days I've updated my LG OLED65CXRLA to 03.23.35 firmware, after that HDR won't work at all.

I own this tv since February, and never had any issues with it, and for the first time I've encountered problem and serious one at that,

Before said update HDR worked without any issues from any source - PC, PS4/Xbox, TV's apps like YouTube and Plex. After update HDR doesn't work from any of said source. 

How it happens: when I launch any HDR content, tv blicks, in upper right corner appears HDR notice, but picture becomes very dark. It's the same as if for example you try to run any YouTube's HDR clip on display without HDR support.

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