KB5012643 for Windows 11 breaks .NET Framework 3.5 apps

This article will help you resolve the issue of KB5012643 for Windows 11 breaking .NET Framework 3.5 apps on your computer.

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KB5012643 for Windows 11 breaks .NET Framework 3.5 apps


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We spoke about the new Safe Mode flaw that affects customers who installed KB5012643 for Windows 11 a week ago.

This nasty issue was not listed on Microsoft’s known issues list on the day of the release, so it caught everyone off guard.

Just when you thought things couldn’t get any worse, Microsoft lays another another bomb on anyone who downloaded this cumulative update.

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More issues are being reported with Windows 11 Build 22000.652.

As a result, Microsoft has issued a warning to Windows 11 users that they may have problems starting and utilizing some.NET Framework 3.5 apps. Does this ring a bell?

Don’t be frightened; this known problem only affects Windows 11 version 21H2 PCs after KB5012643 has been downloaded and installed.

Optional components such as Windows Workflow Foundation (WWF) and Windows Communication Foundation are used by the vulnerable apps (WCF).


What can I do to resolve this issue?

You can’t, to put it bluntly. That said, be assured that the IT behemoth has taken steps to address the problem as quickly as possible.

Meanwhile, Microsoft has graciously requested affected customers to remove KB5012643 while it works to resolve the problem and restore the functionality of their.NET Framework 3.5 applications.

Users who are unable to delete this cumulative update may alleviate the known problem by re-enabling the.NET Framework 3.5 and the Windows Communication Foundation in the Windows Features dialog.

Furthermore, IT Admins may achieve this by performing the following commands in an elevated Command Prompt, which they start as administrators:

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

How can I get rid of KB5012643?

  1. To access Settings, press Windows + I.
  2. Go to the Windows Updates tab and then to Updates history.1651744546_390_KB5012643-for-Windows-11-breaks-NET-Framework-35-apps
  3. Select Uninstall updates from the drop-down menu.1651744547_442_KB5012643-for-Windows-11-breaks-NET-Framework-35-apps
  4. For the update you wish to uninstall, click the Uninstall button.1651744547_327_KB5012643-for-Windows-11-breaks-NET-Framework-35-apps

Have you been able to completely remove KB5012643? Please tell us about your experience in the comments area below.

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The KB5012643 for Windows 11 breaks .NET Framework 3.5 apps is a problem that has been present for a while. Microsoft has released a patch to fix the issue. Reference: best pc hardware.

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