Plugged in and it went to 30Hz automatically. It took me a while to get to 60Hz to figure out how i can get it to work with my samsung tv you need to first go to the settings menu on your samsung tv and enable the HDMI UHD color option this will allow 60hz my macbook + tv restarted next you need to go to the Go to macOS Display Settings, hold down the Option key while pressing Zoom, check the Low resolution box, which allows you to choose the refresh rate, and then press 60 Hz.
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