Microsoft warns users: uninstall Windows 11 KB5012643 if it crashes your apps

Microsoft has just fixed the Safe Mode issues in Windows 11, but the operating system has apparently encountered more issues with the latest cumulative updates. KB5012643, which is an optional update with several fixes, crashes applications that use certain components of the .NET 3.5 framework.

If you've been using Microsoft's desktop operating system for a long time, you've probably noticed the .NET Framework. The .NET Framework may appear on Windows Update or during the installation process of certain applications. Many applications depend on the .NET Framework to function properly because it includes a collection of code that developers can call upon when building their applications.

Simply put, you only need the .NET Framework for some apps to work. Unfortunately, a cumulative update has apparently broken the integration of the .NET Framework into the operating system and some applications are crashing. It happens to whoever installed KB5012643 for Windows 11 version 21H2.

Previously, some users were experiencing safe mode and installation issues as well as a blue screen of death when installing this particular optional update. As Feedback Hub posts point out, there are reports online documenting various issues in the latest Windows 11 update, including a bug where some .NET 3.5 Framework apps crash.

"We ran a SQL application (client and server on the same system) on Windows 11. It worked perfectly on Windows 7 and Windows 10. After installing the Windows 11 KB5012643 update, the applications no longer start. Apps work again without any issues after uninstalling the update,” noted one of the affected users in the Feedback Hub.

Fortunately, this flaw does not affect all applications based on .NET 3.5 Framework. In a new update to a support document originally posted on April 25, Microsoft noted that applications that use certain components, such as Windows Communication Foundation (WCF) and Windows Workflow (WWF), are affected.

We don't have a list of affected apps, but if you're having trouble launching apps in Windows 11, now you know why.

Index

    Microsoft wants users to uninstall the update

    So if you're experiencing app crashes on Windows 11, as described by the user in Feedback Hub and later confirmed by Microsoft, it might be worth uninstalling the fix to see if it makes a difference.

    In the updated document, Microsoft's first workaround recommends removing the update manually. To uninstall the update, follow these steps:

    1. click on it home button and seek Windows Update Settings.
    2. Windows Update settings window, select View update history.
    3. To select uninstall update.
    4. Find KB5012643 in the list.
    5. Select the patch and click uninstall.

    Otherwise, the only other solution is to try your luck by re-enabling .NET Framework 3.5 and Windows Communication Foundation on the Windows Feature Settings page. You can also run the following commands to perform this action through the terminal:

    dism /online /enable-feature /featurename:netfx3 /all
    dism /online /enable-feature /featurename:WCF-HTTP-Activation
    dism /online /enable-feature /featurename:WCF-NonHTTP-Activation

    With these optional updates, you may still encounter undocumented issues, which is why we do not recommend cumulative or optional driver updates.

    In addition to these problems, users also report other issues including issues with startup, taskbar, USB, and more.

    Microsoft has just fixed the Safe Mode issues in Windows 11, but the operating system has apparently encountered more issues with the latest cumulative updates. KB5012643, which is an optional update with several fixes, crashes applications that use certain components of the .NET 3.5 framework.

    If you've been using Microsoft's desktop operating system for a long time, you've probably noticed the .NET Framework. The .NET Framework may appear on Windows Update or during the installation process of certain applications. Many applications depend on the .NET Framework to function properly because it includes a collection of code that developers can call upon when building their applications.

    Simply put, you only need the .NET Framework for some apps to work. Unfortunately, a cumulative update has apparently broken the integration of the .NET Framework into the operating system and some applications are crashing. It happens to whoever installed KB5012643 for Windows 11 version 21H2.

    Previously, some users were experiencing safe mode and installation issues as well as a blue screen of death when installing this particular optional update. As Feedback Hub posts point out, there are reports online documenting various issues in the latest Windows 11 update, including a bug where some .NET 3.5 Framework apps crash.

    "We ran a SQL application (client and server on the same system) on Windows 11. It worked perfectly on Windows 7 and Windows 10. After installing the Windows 11 KB5012643 update, the applications no longer start. Apps work again without any issues after uninstalling the update,” noted one of the affected users in the Feedback Hub.

    Fortunately, this flaw does not affect all applications based on .NET 3.5 Framework. In a new update to a support document originally posted on April 25, Microsoft noted that applications that use certain components, such as Windows Communication Foundation (WCF) and Windows Workflow (WWF), are affected.

    We don't have a list of affected apps, but if you're having trouble launching apps in Windows 11, now you know why.

    Microsoft wants users to uninstall the update

    So if you're experiencing app crashes on Windows 11, as described by the user in Feedback Hub and later confirmed by Microsoft, it might be worth uninstalling the fix to see if it makes a difference.

    In the updated document, Microsoft's first workaround recommends removing the update manually. To uninstall the update, follow these steps:

    1. click on it home button and seek Windows Update Settings.
    2. Windows Update settings window, select View update history.
    3. To select uninstall update.
    4. Find KB5012643 in the list.
    5. Select the patch and click uninstall.

    Otherwise, the only other solution is to try your luck by re-enabling .NET Framework 3.5 and Windows Communication Foundation on the Windows Feature Settings page. You can also run the following commands to perform this action through the terminal:

    dism /online /enable-feature /featurename:netfx3 /all
    dism /online /enable-feature /featurename:WCF-HTTP-Activation
    dism /online /enable-feature /featurename:WCF-NonHTTP-Activation

    With these optional updates, you may still encounter undocumented issues, which is why we do not recommend cumulative or optional driver updates.

    In addition to these problems, users also report other issues including issues with startup, taskbar, USB, and more.

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