KB4520008 updates Windows 10 1803 to Build 17134.1069 – 8 Oct 2019

Microsoft unveils another new cumulative update KB4520008 having an assortment of new features for Windows 10 1803 users on 8th October 2019. This is basically a security patch that takes the existing OS to build 17134.1069 along with updating IE, Edge, storing and managing files, and Windows Components. Furthermore, this patch works upon a long-awaited issue with applications and printer drivers that utilize the Windows JavaScript engine.

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Users can get KB4520008 by checking for updates on Windows Update. They can also install the patch by downloading offline installers. The company rectifies a long-time occurring error which reduces CPU utilization as well as decreases connection latency.


KB4520008 – Fixes and Improvements

Here, we depict the key features that came along with the KB4519338 security update-

  • The tech community resolves an issue in the Keyboard Lockdown Subsystem that may not filter key input correctly. 
  • They also work upon another problem that deals with the Bluetooth hardening updates. It was primarily released on August 13, 2019, that may cause a “0x133 DPC_WATCHDOG_VIOLATION” error.
  • After updating to the Build 17134.1069, users may utilize the CPU to the fullest along with increased connection latency. Prior to this build, there was an issue on the security bulletin CVE-2019-1318 that impedes client or server computers from supporting Extended Master Secret (EMS) RFC 7627. This type of obstruction occurs mainly when you perform a full Transport Layer Security (TLS) handshake from devices that don’t support EMS, especially on servers. Since 2015, the company has enabled EMS support for all of the supported Windows 10 versions. This becomes a requirement when you upgrade your OS to Windows 10 19H2 or forthcoming monthly updates.
  • Microsoft team rectifies the application or printer driver uses the Windows JavaScript engine (jscript.dll) to perform print jobs.
  • Rolls security updates for the following-
    • Windows Server
    • Microsoft Scripting Engine
    • Internet Information Services
    • Windows Kernel
    • Windows App Platform and Frameworks
    • Microsoft JET Database Engine
    • Windows Authentication
    • Windows Cryptography
    • Microsoft Edge
    • Windows Shell
    • Internet Explorer
    • Windows Storage and File-systems
    • Windows Datacenter Networking

KB4520008 – Known Issues

Symptom Workaround

On performing certain actions with build 17134.1069, like renaming of files and folders, this may prompt the following error message –


This defect arises when you don’t have administrative privileges to execute these actions on a Cluster Shared Volume.

To resolve this bug, perform the operation using-

A procedure that has admin rights.
A node that doesn’t require CSV ownership.

The Company may release a permanent solution to this very soon as they are currently working on a resolution.

The company is investigating the issue that leads to a black screen on a few devices. 

Basically, this trouble arises with KB4520008 when signing into your PC for the first time after installing the latest cumulative update. 

To resolve the underlying cause –

  • Press the Ctrl+Alt & Delete keys.
  • Thereafter choose the Power button and hit the Restart button.

The Company may release a permanent solution to this very soon as they are currently working on a resolution.

On getting KB4520008, users may get a “15-5” error message on Windows Mixed Reality Portal.

Besides, in some situations, Windows Mixed Reality Portal may report that the headset is sleeping. If you press “Wake up”, this might result in “no action”.

To fix this anomaly, simply follow these steps-

  1. Close the Windows Mixed Reality Portal, if it is running.
  2. Open Task Manager by selecting the Start button and typing “task manager.
  3. In Task Manager, under the Processes tab, right-click Windows Explorer and select Restart.
  4. Open the Windows Mixed Reality Portal.

How to get this Update

We suggest you download the KB4521861 servicing stack update before proceeding to install KB4520008. This ensures no bug appears during the whole update process. You may get this patch update through following ways-

1. Windows Update

Navigate to Settings > Update & Security > Windows Update and tap “Check for Updates” button.

2. Microsoft Update Catalog

Click here to download the standalone package.