You have an issue with your 4k TV’s service menu.
For example, your TV has been connected to a TV tuner, and you can’t connect to your TV’s settings.
You’ll need to re-set the TV tuners settings.
4k-capable TVs can’t read or write to a file on your SD card, so you’ll need a third-party tool to read or move data from your SD Card to your computer.
The Netflix app also works in 4k, but it doesn’t work in 1080p.