Compatible Amazon Fire TV devices support video streaming in 4K Ultra HD for selected movies and TV shows.
These Amazon Fire TV devices support video streaming in 4K Ultra HD:
4K Ultra High Definition (4K Ultra HD or UHD) offers enhanced picture resolution up to 2160p, which is four times greater than HD.
With a compatible Amazon Fire TV device, you can watch available UHD content from Prime Video and other streaming video services.
An "Ultra HD" indicator displays in your video playback controls when you're streaming in 4K Ultra HD. Your screen can briefly flicker or turn black while your TV display changes to UHD resolution.
To watch movies and TV shows in 4K Ultra HD, you need a compatible Ultra HD TV. The Ultra HD TV must have at least one HDMI input that supports HDCP 2.2 content protection standards.
HDCP is an access control technology required by most content providers to play back protected digital content. What is Content Protection?
You can only watch movies and TV shows in 4K Ultra HD from Prime Video and Netflix if your Fire TV device is connected to an HDMI port that supports HDCP 2.2. Any other devices that are part of your home theater setup (such as HDMI receivers and sound bars) also must support HDCP 2.2.
Fire TV devices automatically detect whether HDCP 2.2 requirements are met. You can also check to see whether your TV supports HDCP 2.2 from the Fire TV Display menu.
Go to Settings > Display & Sounds > Display and open the Video Resolution section. When video resolution is set to "Auto," a notification displays in the right panel if HDCP 2.2 is not detected for your Fire TV's HDMI connection.
Support for 4K Ultra HD video is not available on Amazon Fire TV (1st Generation) and Fire TV Stick (1st and 2nd Generation).
To stream in 4K Ultra HD, you need a high-speed internet connection of at least 15 Mbps. Some video apps need even faster speeds to stream in 4K Ultra HD. For example, Netflix recommends a connection of at least 20 Mbps.
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