Windows 11 update KB5009566 (build 22000.434) outs with fixes

The first Patch Tuesday update for Windows 11 releases with a bunch of fixes and improvements.

Windows 11 KB5009566
Windows 11 KB5009566

As part of the first cumulative update of 2022, Microsoft is now rolling out the Windows 11 update KB5009566 with several fixes.

KB5009566 bumps the version number to build 22000.434, and according to the official notes, it fixes text showing out of order, or the text cursor might move unexpectedly in apps on devices using Japanese Input Method Editors (IME).

Also, the update KB5009566 fixes close to one-hundred vulnerability problems, including six zero-day vulnerabilities and more than 95 security vulnerabilities, which you can review in more detail at the Security Update Guide and the January 2022 Security Updates website.

If you are still on Windows 10, Microsoft is also making available for download updates for supported releases, including versions 21H2, 21H1, 20H2, 1909, 1809, 1607, and 1507.

The update download and install automatically, but you can always force it from Settings > Windows Updates and click the Check for Updates button. Alternatively, you can download the update KB5009566 directly from the Microsoft Update Catalog website.

Uninstall update KB5009566

If the system update is causing issues, you can always uninstall it using these steps:

  1. Open Start on Windows 11.

  2. Search for Command Prompt, right-click the top result, and select the Run as administrator option.

  3. Type the following command to view the update history and press Enter:

    wmic qfe list brief /format:table
  4. Check the Windows Update history of your device, and identify the update by its HotFixID and InstalledOn information.

  5. Type the following command to uninstall the update from your computer and press Enter:

    wusa /uninstall /kb:5009566
    Quick note: In the command, replace “5009566” for the KB number corresponding to the update you are trying to uninstall.
  6. Click the Yes button.

  7. Continue with the on-screen directions (if applicable).

Once you complete the steps, the recently installed update will be removed from your installation, fixing any issues resulting from the release.

If your computer doesn’t boot after installing KB5009566, you can remove the update from the Advanced startup environment using these steps.

About the author

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 14 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and Email him at [email protected].