Windows 11: update is breaking apps; see how to uninstall

Microsoft has recommended Windows 11 users to uninstall KB5012643, an optional update that brings fixes to the operating system, but is causing crashes in several applications, especially those using the .NET Framework 3.5. Crashes consist of unexpected crashes that occur from installation to upgrade.

The .NET Framework is software that loads and runs applications that are not developed by Microsoft. It works similarly to the Java virtual machine, only it is unique to Windows. And it was precisely the integration of this platform with certain apps that was affected on the desktop of those who installed KB5012643 for Windows 11 version 21H2.

The good news is that the detected fault does not affect all applications built on .NET 3.5 Framework. According to an update to a Microsoft support document originally published on April 25, the company explained that only software that uses components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) are affected.

How to uninstall KB5012643 update?

Source: Microsoft/Reproduction.Source: Microsoft/Reproduction.Source: Microsoft

In any case, Microsoft expressly recommends in the document that update KB5012643 is removed manually. It is important to note that this is an optional update, which makes the number of affected users much lower than when it comes to mandatory updates, which are installed automatically.

To uninstall the update, simply follow these steps:

  1. open the menu Start and search Windows Update Settings;
  2. In Windows Update, select the option update history;
  3. Scroll to the bottom and select uninstall updates;
  4. In the new open screen, find and select to KB5012643 in the displayed list;
  5. click in uninstall.

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