Your SHIELD TV supports 4K Ultra HD (3840 x 2160p) resolution content with HDR10 or Dolby Vision, from many apps.

To ensure that your SHIELD TV is optimized for 4K video output, keep your device updated with the latest system software.

Watching 4K content from SHIELD TV requires a 4K display with HDMI 2.0 and HDCP 2.2 support.  Make sure SHIELD TV is connected to an HDMI input that supports HDCP 2.2.  Consult your 4K display's user guide to find the correct HDMI port to plug SHIELD TV for watching 4K content.

Consider using the HDMI-UHD port for 4K support.  Some TVs by default have UHD input disabled in TV settings, so please make sure that UHD is enabled in the settings for your TV for this input.