A firmware update is provided to improve the stability of the Surface Pro 4 keyboard on Surface Pro 3.
This update increases battery life during sleep mode and improves keyboard stability.
How to get this update
This update will be downloaded and installed automatically. It will be listed in the Windows Update history as follows:
System Firmware Update – 7/21/2016
There are no prerequisites for installing this update.
You don't have to restart the computer after you apply this update.
Update replacement information
This update doesn't replace a previously released update.
Surface Pro System Aggregator Firmware (v3.9.850.0)
Learn about the terminology that Microsoft uses to describe software updates.