This update changes the factory image version to 15.15.9 to let you create new factory images for Microsoft Lync Room System (LRS) devices. This enables you to bundle the Microsoft security fixes for the "WannaCry" virus.
How to get this update
To get this update, install the August 1, 2017, update (KB4011046) for Microsoft Skype for Business 2015 (Lync 2013).
Note Lync 2013 was upgraded to Skype for Business in April 2015.