In the settings in Swisscom TV I can set the picture quality to UHD, but in the UHD test it says that at least one of the HDMI cables or devices connected to your TV box does not support UHD. Changing the HDMI cable does nothing. Error because native, and the beamer only upscales?

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Accepted Answer

Have you ever changed the HDMI input on the beamer from 2.0? Simply hold down the confirmation button for Hdmi selection and activate it in the settings.

Answer

I myself have an Optoma Cinemax P2 beamer that only achieves UHD with Pixel Shift (native resolution 1080p). 
But when I connect it to my UPC TV box it says 2160p (UHD) in the top left corner.
I also had the Xiaomi but returned it because of too little brightness and noise at the audio jack.
I am now very satisfied with the Optoma.
Greetings

Your data. Your choice.

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Question about Xiaomi Mi Mijia

In the settings in Swisscom TV I can set the picture quality to UHD, but in the UHD test it says that at least one of the HDMI cables or devices connected to your TV box does not support UHD. Changing the HDMI cable does nothing. Error because native, and the beamer only upscales?