KB4520008 fixes Bluetooth hardening updates and more

Teodor Nechita
by Teodor Nechita
Software Managing Editor
Eager to help those in need, Teodor writes articles daily on subjects regarding Windows, Xbox, and all things tech-related. When not working, you may usually find him either at the gym or taking a... Read more
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Windows 10 fans rejoice as the October 2019 Patch Tuesday hit live and brings an assortment of new features.

KB4520008 boasts several neat highlights, including:

  • Improvements to general keyboard input
  • several necessary Bluetooth updates
  • Several security updates for Internet Explorer, Microsoft Edge and more


KB4520008 Changelog

  • Addresses an issue in the Keyboard Lockdown Subsystem that may not filter key input correctly.
  • Addresses an issue with the Bluetooth hardening updates, released August 13, 2019, that may cause a “0x133 DPC_WATCHDOG_VIOLATION” error.
  • Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.
  • Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
  • Security updates to Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Datacenter Networking , Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server.

Several issues come with KB4520008 as well

There have been some reported issues with this update, such as issues renaming folders from CSVs, and that some devices startup with a black screen.

There have also been reported an issue with Mixed Reality users, probably caused by a bad implementation of the Microsoft HoloLens update.

If you are running an older update, only the newest features will be downloaded and applied to your device.

Have you installed the latest update? Is it causing any issues with your PC?

Let us know in the comments section below!

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