Win Update KB5070773 Windows 11 Out-of-band Update build 26100.6901 (24H2) and 26200.6901 (25H2) - Oct. 20

UPDATE 10/28:

October 20, 2025 - KB5070773 (OS Builds 26200.6901 and 26100.6901) 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.


To learn about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows 11, version24H2 and version 25H2.

Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release Health Dashboard.

Improvements​

This out-of-band (OOB) update includes quality improvements. This update is cumulative and includes security fixes and improvements from the October 14, 2025, security update (KB5066835), in addition to the following:

• [USB] Fixed: After installing the Windows security update released on October 14, 2025 (KB5066835), USB devices, such as keyboards and mice, do not function in the Windows Recovery Environment (WinRE). This issue prevents navigation of any of the recovery options within WinRE. Note that the USB devices continue to work normally within the Windows operating system.

AI Components​

This release updates the following AI components:

Windows 11 servicing stack update (KB5067360)- 26100.6893​

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.

Known issues in this update​

Symptoms
Some Digital TV and Blu-ray/DVD apps might not play protected content as expected after installing the August 29, 2025, Windows non-security preview update (KB5064081), or later updates.

Apps that use Enhanced Video Renderer with HDCP enforcement or Digital Rights Management (DRM) for digital audio might show copyright protection errors, frequent playback interruptions, unexpected stops, or black screens.

Streaming services are not affected.

Workaround
The non-security September 2025 Windows preview update (KB5065789) and later updates address problems affecting certain applications that use the Enhanced Video Renderer (EVR) with HDCP (High-bandwidth Digital Content Protection) enforcement. The non-security October Windows preview update (KB5067036) includes additional improvements to address problems affecting applications using Digital Rights Media (DRM) for digital audio.


Symptoms
After installing the non-security September update (KB5065789) for Windows 11, version 25H2, or the security October update (KB5066835) for Windows 11, version 24H2, server-side applications that rely on HTTP.sys might experience issues with incoming connections. As a result, Internet Information Services (IIS) websites might fail to load and display an error message such as “Connection reset – error (ERR_CONNECTION_RESET)” or a similar message. This includes websites hosted on http://localhost/ and other IIS connections.

This issue may result from various conditions, including internet connectivity, timing of update installation, and device restarts. It might not occur in all environments, even if the update is installed.

The following steps can help resolve this issue in environments where it's observed:

1. On the affected device, open Settings and go to Windows Update.
2. Select Start , type Check for updates, and Check for updates from the results.
3. If updates are available, install them.
4. Restart your device.

Note: Make sure to restart your device, even if no updates are installed.

Workaround

This issue is addressed in KB5067036.

How to get this update​

Before you install this update

Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

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

1 This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.

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

For a list of the files provided in this update, download the file information for cumulative update 5070773.

For a list of the files provided in the servicing stack update, download the file information for the SSU KB5067360 - version 26100.6893.






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