It is common on TV’s and some AVR’s that you must enable a specific setting to enable HDR. For example on LG televisions HDR is enabled by default for the internal player and apps but not for external devices. There is an option buried in the settings called “HDMI ULTRA HD Deep Color” that must be enabled for the port the device is connected though in order for HDR to activate. Consult the manuals for your equipment.
As for the settings on the Vero…
We recommend people with 4K TV’s set their user interface (UI) to 1080p. Kodi’s UI is not optimized for 4K yet and this can put unnecessary demands on your device and can lead to a suboptimal picture quality, as well as potentially cause other issues.
The settings we recommend are as follows…
Settings>Player>Videos>Adjust display refresh rate> On start/stop
Some televisions may also need, or benefit from, the following being set…
System>Display>Force 4:2:2 colour subsampling> (enable)
With the above settings your UI will be output in Full HD and your 4K content will be output in 4K. If you have any doubt, feel free to upload some logs so we can verify that your settings are indeed correct.