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UE49KU6400 HDMI UHD

Apprentice

I am running my UHD blu ray player into the HDMI2 port with the HDMI3 ARC going back through the AV amp & have my STB going into the amp (not HDMI1 on the TV).

I am trying to set HDMI UHD to on for all 3 HDMI ports & am only able to set for HDMI1.

The other 2 are greyed out despit having active connections to them.

How can I set to on for all 3 ports?

 

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