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*****(curse-word), had it on 4k HDR for a while this afternoon. Even both UHD and HDR vignettes.
But unfortunately it didn't last.
Don't know why it is not working anymore.
I'm gonna look for another receiver, this one stinks, linked with the Samsung 55Q9F.
(Quite possibly a HDMI-CEC handshake issue; I asked Denon_UK about it, also Samsung).