KB5012643 for Windows 11 breaks .NET Framework 3.5 apps

It’s been a week since we talked about the new safe mode bug affecting users who installed KB5012643 for Windows 11.

This pesky issue didn’t appear on Microsoft’s list of known issues posted on launch day, thus catching everyone by surprise.

Well, just when you thought things couldn’t get worse, Microsoft drops another bomb for users who have installed this cumulative update.

Windows 11 Build 22000.652 causes more problems

So the tech company is warning Windows 11 users that they may experience problems launching and using some .NET Framework 3.5 apps . Sound familiar?

Don’t panic though, as this known issue only affects systems running Windows 11 version 21H2 after KB5012643 is downloaded and installed.

The affected software uses optional components such as Windows Workflow (WWF) and Windows Communication Foundation (WCF).

How do I solve this problem?

The short answer is you can't. That being said, know that the tech giant will address this issue as soon as possible.

In the meantime, Microsoft implores affected users to uninstall KB5012643 to resolve the issue and restore functionality to their .NET Framework 3.5 applications.

Users who find themselves unable to uninstall this cumulative update immediately can actually mitigate known issues by re-enabling .NET Framework 3.5 and Windows Communication Foundation from the Windows Features dialog box.

Alternatively, IT administrators can accomplish this using an elevated command prompt, which they launch as an administrator by running the following command:

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

How to uninstall KB5012643 ?

1. Press Windows I to open settings.
2. Select the Windows Update tab and click Update History.
3. Click to uninstall updates.
4. Click the Uninstall button for the update you want to remove.

Have you successfully uninstalled KB5012643? Share your experience with us in the comments section below.

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