UPDATE 8/27:
www.elevenforum.com
Windows Secure Boot certificate expiration
Important
Secure Boot certificates used by most Windows devices were set to expire starting in June 2026. Microsoft has been updating these certificates on PCs and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
End of updates
Windows 11, version 24H2 Home and Pro editions will reach end of updates on October 13, 2026. Devices running these editions will no longer receive fixes for known issues, time zone updates, technical support, or monthly security and preview updates containing protections from the latest security threats. Enterprise and Education editions remain supported until October 12, 2027.
To stay protected and up to date, we recommend you upgrade to the latest version of Windows 11.
www.elevenforum.com
Change log
This release updates the following AI components to version 1.2605.856.0: Image Search, Content Extraction, Semantic Analysis, and Settings Model. To learn more, see Release information for AI components.
Servicing stack update
Includes KB5123304 (Build 26100.9156), which improves the reliability of the Windows update installation process. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
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.
Note
The boot.stl file is used during Secure Boot validation and must match the Windows version and architecture of the image you are updating.
To ensure the boot.stl file is included as part of the installation media, do one of the following:
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5123304) - version 26100.9156.
support.microsoft.com
Check Windows Updates
ISO from Microsoft MCT:
www.elevenforum.com
UUP Dump:
64-bit ISO download:
ARM64 ISO download:
www.elevenforum.com
KB5120998 Windows 11 Cumulative Update Preview build 26100.9278 (24H2) and 26200.9278 (25H2) - Aug. 27
Microsoft Support: Source: Check Windows Updates UUP Dump: 64-bit ISO download: https://uupdump.net/selectlang.php?id=d922b79f-142d-4cf8-896b-515abfd01e66 https://uupdump.net/selectlang.php?id=c1c737c2-f2d9-4824-bb5b-1af515179099 ARM64 ISO download...
www.elevenforum.com
Microsoft Support:
Announcements and messages
This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.Windows Secure Boot certificate expiration
Important
Secure Boot certificates used by most Windows devices were set to expire starting in June 2026. Microsoft has been updating these certificates on PCs and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
End of updates
Windows 11, version 24H2 Home and Pro editions will reach end of updates on October 13, 2026. Devices running these editions will no longer receive fixes for known issues, time zone updates, technical support, or monthly security and preview updates containing protections from the latest security threats. Enterprise and Education editions remain supported until October 12, 2027.
To stay protected and up to date, we recommend you upgrade to the latest version of Windows 11.
Reminder: Windows 11 version 24H2 reaching end of updates on October 13, 2026
Windows message center: On October 13, 2026, Windows 11, version 24H2 Home and Pro editions, and Windows 10 Enterprise LTSB 2016 will reach end of updates. After this date, devices running these editions will no longer receive monthly security and non-security preview updates containing...
www.elevenforum.com
Change log
Change date | Change description |
|---|---|
| September 3, 2026 | Added a known issue, "Microsoft Teams and Outlook might fail to launch on ARM-based devices". |
| August 27, 2026 | Added a resolution for the known issue, "Reports of certain games becoming unresponsive". |
| August 21, 2026 | Added a workaround for the known issue, "Reports of certain games becoming unresponsive". |
| August 20, 2026 | Added a known issue, "Reports of certain games becoming unresponsive". |
| August 17, 2026 | Update added, "[Sharing] This update removes the Drop Tray experience (previously named Drag Tray) for devices where it was available. It also removes the associated setting under Settings > System > Multitasking. We are continuing to evaluate the experience and explore future enhancements." |
Improvements
This update includes improvements from the following previously released updates:- July 28, 2026—KB5101684 (OS Builds 26200.8973 and 26100.8973) Preview
- July 18, 2026—KB5121767 (OS Builds 26200.8894 and 26100.8894) Out-of-band
- July 14, 2026—KB5101650 (OS Builds 26200.8875 and 26100.8875)
- [Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide
- [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
- [Sharing] This update removes the Drop Tray experience (previously named Drag Tray) for devices where it was available. It also removes the associated setting under Settings > System > Multitasking. We are continuing to evaluate the experience and explore future enhancements.
Enable or Disable Drop Tray in Windows 11
This tutorial will show you how to enable or disable the Drag/Drop Tray feature for your account in Windows 11. Starting with Windows 11 build 26100.4202 (24H2) and build 22631.5413 (23H2), sharing files in Windows is getting a lot easier and quicker with the Drag Tray feature. When you start...
www.elevenforum.com
Components updates
AI componentsThis release updates the following AI components to version 1.2605.856.0: Image Search, Content Extraction, Semantic Analysis, and Settings Model. To learn more, see Release information for AI components.
Servicing stack update
Includes KB5123304 (Build 26100.9156), which improves the reliability of the Windows update installation process. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
Known issues in this update
Symptoms
Microsoft received reports of issues involving inability to run certain games as expected after installing this update.
Ongoing investigation indicates that this issue is associated with certain peripherals or internal device components that support RGB lighting features. These devices might install drivers or software components with file names similar to inpoutx64. On systems where these drivers are found, launching certain games can trigger this issue.
Games identified in reports of this issue include ARC Raiders, MARVEL Tōkon: Fighting Souls, and THE FINALS. Reported symptoms include:
Resolution
This issue is resolved by a block that prevents the inpoutx64 driver from loading on affected devices. When the block is applied, a message is displayed that states the driver has been disabled, after which the game will launch normally.
This resolution is available automatically to consumer and business devices that are not managed by IT departments. For enterprise-managed devices, the mitigation will not propagate automatically. IT administrators can follow the steps in the workaround section on the Windows release health site.
Microsoft received reports of issues involving inability to run certain games as expected after installing this update.
Ongoing investigation indicates that this issue is associated with certain peripherals or internal device components that support RGB lighting features. These devices might install drivers or software components with file names similar to inpoutx64. On systems where these drivers are found, launching certain games can trigger this issue.
Games identified in reports of this issue include ARC Raiders, MARVEL Tōkon: Fighting Souls, and THE FINALS. Reported symptoms include:
- the game application becomes unresponsive
- the game application closes without notice
- the error "EXCEPTION_ACCESS_VIOLATION" is displayed
- the device restarts without warning
Resolution
This issue is resolved by a block that prevents the inpoutx64 driver from loading on affected devices. When the block is applied, a message is displayed that states the driver has been disabled, after which the game will launch normally.
This resolution is available automatically to consumer and business devices that are not managed by IT departments. For enterprise-managed devices, the mitigation will not propagate automatically. IT administrators can follow the steps in the workaround section on the Windows release health site.
Symptoms
After installing Windows security updates released on or after August 11, 2026, (KB5121003), Microsoft Teams and the new Outlook for Windows might fail to launch or might close unexpectedly on ARM-based devices, such as Surface Pro 11 and Surface Laptop 7. Classic Outlook, Word, Excel, and other applications are not known to be affected. This issue is most likely to occur on new or freshly imaged PCs that have not yet installed any Microsoft Store updates.
Workaround
To work around this issue:
We are working on releasing a resolution for this issue in a future Windows update. We will provide an update when more information is available.
After installing Windows security updates released on or after August 11, 2026, (KB5121003), Microsoft Teams and the new Outlook for Windows might fail to launch or might close unexpectedly on ARM-based devices, such as Surface Pro 11 and Surface Laptop 7. Classic Outlook, Word, Excel, and other applications are not known to be affected. This issue is most likely to occur on new or freshly imaged PCs that have not yet installed any Microsoft Store updates.
Workaround
To work around this issue:
- Open Microsoft Store.
- Select Downloads > Check for updates.
- Install the latest update for the Auto Super Resolution Package (version 1.0.19.0 or later).
We are working on releasing a resolution for this issue in a future Windows update. We will provide an update when more information is available.
How to get this update
Before you install this updateMicrosoft 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.
Deployment
If you deploy dynamic updates such as this update to an existing Windows image, ensure the boot.stl file is included as part of the installation media. Failure to include the file might prevent devices from successfully starting from the installation media and can result in error code 0xc0430001.Note
The boot.stl file is used during Secure Boot validation and must match the Windows version and architecture of the image you are updating.
To ensure the boot.stl file is included as part of the installation media, do one of the following:
- Use the Update WinPE script to update an existing Windows image. (Recommended)
- Manually copy the boot.stl file from the device Windows\Boot\EFI folder to the corresponding folder on your installation media before deploying the update.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.Available | Next Step |
|---|---|
 | This update downloads and installs automatically from Windows Update and Microsoft Update. |
| To install this release from the Microsoft Update Catalog, select the option that matches your device architecture (arm64 or x64), and then follow the instructions. |
File information
For a list of the files provided in this update, download the file information for cumulative update KB5121003.For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5123304) - version 26100.9156.
Source:
August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168) | Microsoft Support
August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168)
support.microsoft.com
Check Windows Updates
ISO from Microsoft MCT:
Download Official Windows 11 ISO file from Microsoft
This tutorial will show you how to download an official Windows Server or Windows 11 64-bit or ARM64 ISO file from Microsoft. Microsoft provides ISO files for Windows Server and Windows 11 to download. You can use these ISO files to clean install or in-place upgrade Windows 11. The Flight Hub...
www.elevenforum.com
UUP Dump:
64-bit ISO download:
Select language for Windows 11, version 24H2 (26100.9168) amd64
Select language for Windows 11, version 24H2 (26100.9168) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net
Select language for Windows 11, version 25H2 (26200.9168) amd64
Select language for Windows 11, version 25H2 (26200.9168) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net
ARM64 ISO download:
Select language for Windows 11, version 24H2 (26100.9168) arm64
Select language for Windows 11, version 24H2 (26100.9168) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net
Select language for Windows 11, version 25H2 (26200.9168) arm64
Select language for Windows 11, version 25H2 (26200.9168) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net
UUP Dump - Download Windows Insider ISO
UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...
www.elevenforum.com
Last edited:
