OS Build 15254.603
Windows 10 Mobile, version 1709 reached end of service on January 14, 2020. Devices running Windows 10 Mobile and Windows 10 Mobile Enterprise will no longer receive monthly security and quality updates that contain protection from the latest security threats.
For more information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article.
Improvements and fixes
This security update includes quality improvements. Key changes include:
This build includes all the improvements from KB4534276.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
This update will be downloaded and installed automatically from Windows Update.