Go into SettingsChange Resolution to 4K (duh)

Change Image Area to Super 35
Exit Settings

Tap on FPS in top right of screen
Toggle "Slow" slider on the bottom
Scroll down to "60" in the first scroll selector then select "120" in the second selector.
Then you have to accept the new ratio size.
Ta da! 4K at 120FPS

Thank you, Trying it out tonight

Thank you, it worked perfectly. I doubt I'll be able to avoid the User Manual for ever but you have answered something I was wondering about.