A note on HDMI cables
Roku players that support HDR ship with an HDMI 2.0 compatible cable. If you cannot use the included cable, be sure to purchase a Premium High Speed HDMI Cable or Ultra High Speed HDMI Cable. The typically more expensive Ultra High Speed HDMI Cable is a good choice for reducing potential Wi-Fi® and Bluetooth® interference, or for future-proofing an installation where the cable location is in an otherwise inaccessible area. Cables that are not labeled or may be labeled "high speed" or "standard speed" may not be adequate for 4K HDR10, HDR10+, or Dolby Vision content at 60fps.
If your Roku player is connected to an AVR or soundbar, make sure all cables are HDMI 2.0 compatible. If you see a black screen or poor performance and video degradation with a 4K HDR signal, replace any older cables with a Premium High Speed HDMI Cable or Ultra High Speed HDMI Cable.