Maybe it's a Western Digital SN810 Solid State Drive Firmware Update Check if your system is using WD SN810.
My Precision 3660 tower's Windows 10 Update is showing I need to restart for an update identified as: "Dell, Inc. - Firmware - 61.91.25.23" I can't find anything anywhere that would identify what this is. There is no driver/update I can find at Dell support that is identified with 61.91.25.23. What is this, and where did it come from? [IMAGE]
Windows Update wants to install Dell, Inc. Firmware 61.91.25.23 on my Precision 
3660