Update KB4509478 (Build 17134.860) for Windows 10, version 1803

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Microsoft released cumulative update KB4509478 (OS Build 17134.860) for Windows 10 April 2018 Update (version 1803) and Windows Server 2016 (1803). How to download and install a new build

Microsoft released the KB4509478 update package for Windows 10 version 1803 (April 2018 Update) based on x86, x64 (amd64), ARM64, and Windows Server 2016 (1803) processors for x64-based systems.

Installing via Windows Update

Cumulative update 4509478 for PC is installed automatically through Windows Update. To test, go to the Options > Update and Security menu and click Check for Updates. To complete the installation, you will need to restart the computer. After the upgrade, the Windows 10 build number will change to 17134.860.

Installing and configuring Windows 10 updates

Download update KB4509478

You can also download the update from the Microsoft Update Catalog and install it manually using the link below:

Download KB4509478

To install an MSU file, simply double-click on the file. You can apply additional parameters (for example, /silent for a background installation) — the installation of the MSU update package.

Improvements and fixes KB4509478 (17134.860)

This update includes quality updates. New features of the system are not presented. List key changes.

  • Fixed an issue that blocked devices from connecting to some Storage Area Network (SAN) devices using the  iSCSI interface after installing  KB4497934. An error could appear in the Windows log with the event code 43 from the iScsiPrt source and with the following wording in the Description field: “Target failed to respond in time for a login request.”.

If you installed previous updates, this time only new changes will be applied to the cumulative package.

Known bugs

  • Some operations, such as rename, may not work for Cluster Shared Volume (CSV) and result in the error “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”.
  • It is reported that a small number of devices may encounter a black screen when they first log in after installing the update. If you encounter this problem, click Ctrl + Alt + Delete, click the Power button in the lower-right corner and select Reboot.


You can download the file below:

x64 download update
x86 download update
ARM64 download update
Windows Server 2016 download update