Get the picture right: 4K, HDR and frame rate

Open Settings, then Display & Sound, then Resolution. Leave it on Auto unless you have a reason not to — the box reads your television's capabilities over HDMI and picks the highest mode both ends support.

Force a mode only when troubleshooting. If you force 4K 60Hz on a television that accepts only 4K 30Hz over that particular port, you get intermittent black frames rather than a clean failure.

HDR switches on automatically when the content, the app and the television all support it. You will usually see a brief black frame as the television changes mode, and a badge in the corner on most sets.

• Use the HDMI port on your television that is marked for 4K HDR — on many sets only one or two ports carry the full bandwidth.
• Enable the enhanced or 'deep colour' mode for that port in the television's own settings. It is off by default on most televisions.
• Use the supplied high-speed HDMI cable. Older cables carry 4K but drop HDR metadata.

Nine times out of ten this is the television's HDMI port running in its limited colour mode. Enable the enhanced format for that port, then restart the box. If it persists, set the box to SDR for that app — some catalogues tone-map badly on non-premium panels.