TiVo Bolt DVR/Streamer
My cable system has a few 4K channels at 60 fps. When I tune my Bolt to any of them, the TiVo recognizes the 2160p signal, but sends a dark and undersaturated picture to my Samsung QLED 4K TV. The sharper detail of the 4K picture is evident compared to the 1080p picture, but it is unwatchable...