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1080p 60fps is 4K recording
The 1080p 30fps is the standard used by many phones
For the 4K option open camera then in the bottom right corner tap the icon for more options and you should see the option to choose 4K etc etc
The Z2 includes 4K video recording at 30 frames per second with SteadyShot image stabilisation, but videos will only play back in full HD on its 1080p screen.
There's Timeshift video, which'll let you shoot and quickly edit slow motion video at 120 frames per second
It really isn't hard to read instructions so apologies if I said 60 instead of 30