Sony has released its latest firmware update for the a9II, bringing with it a collection of new and improved features.

Starting with what’s new, firmware version 2.00 for the Sony a9 II adds a new ‘Hi Frequency Flicker’ function that helps to ‘reduce the impact of flickering of artificial light sources (e.g. digital signage, electronic signboards, LED lights, etc.), by more finely adjusting the shutter speed.’ Also added is a new function that will close the shutter when you turn off the camera to minimize the chance of dirt or dust getting on the image sensor.
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https://www.dpreview.com/news/7548351845/sony-releases-2-00-firmware-update-for-its-a9-ii-mirrorless-camera