Well I'm downloading a new FireOS version 18.104.22.168 (PS7216/1582) but I'm not a YouTube user.YouTube is finally outputting correctly in HDR on the Fire TV Stick 4K. Can anyone confirm if the Cube is fixed as well? Thanks!
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Edit: After the reboot my video resolution changed to 1080p so I reset to Auto 4K. Other settings did not change.