August 19, 2025—KB5066187 (OS Build 17763.7683) Out-of-band

Windows Secure Boot certificate expiration

Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.

Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.

Support for Windows 10 will end in October 2025

After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11.

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Summary

This article lists the fixed issues and quality improvements included in this out-of-band update.

Applies to: Windows 10 Ent LTSC 2019, Windows 10 IoT Ent LTSC 2019, and Windows 10 IoT Core LTSC

This out-of-band update includes fixes and improvements that are a part of the following update:

August 12, 2025—KB5063877 (OS Build 17763.7678)

The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

[Fix for reset and recovery issue] This update addresses an issue introduced by the August 2025 security update (KB5063877) in which attempts to reset and recover the device fails. This issue happens when users perform one or more of the following processes:
- System >Recovery > Reset my PC
- System > Recovery >Fix problems using Windows Update
- RemoteWipe CSP
For more information on this issue, see its documentation on Windows release health. We recommend you install this optional OOB update if you have encountered this issue. If your system isn’t affected or you don’t plan using the methods described above, you can choose not to install the update.

Known issues in this update

We are currently not aware of any issues with this update.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For information about security vulnerabilities, please refer to the new Security Update Guide website and the August 2025 Security Updates.

For more information about Windows 10, version 1809, see its update history page.

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types.

Windows 10 servicing stack update (KB5062800) - 17763.7557

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing updates.

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. To learn more about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

How to get this update

Before you install this update

You must install the August 10, 2021 SSU (KB5005112) before installing this update.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

Available	Next Step
	This update is only available from the Windows Update Catalog.

If you want to remove the LCU

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File information

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Download Icon Download the file information for this out-of-band update KB5066187 now.