The version of the firmware is listed in the right pane. To check the firmware version on your Unifying receiver, go to Unifying Software / Advanced, and then select the Unifying Receiver. Instructions to update the Unifying firmware on Windows *Update* The site linked to above now has a login-wall. The instructions can be found here on Logitech’s site. The bonus is that the new firmware fixes a security flaw. The fix that worked for me was updating the firmware on the unifying receiver. Instead it would jump around, bounce back in the wrong direction and be generally unpredictable.
Ideally one scroll of the scroll wheel would produce the same amount of scrolling each time and in the proper direction. My Logitech M705 started acting strange with scrolling.
