Why can't select the 2.7K or 4K resolution of EK7000?

1) Please check your SD card. Only when you use a Class 10 SD card or higher speed, you can record videos with a resolution of 4K or 2.7K.
2) Have you turned on the loop recording? If so, you can't record videos with a resolution of 2.7K or 4K. Please reset the camera and have a try.