In January 2022, Microsoft is releasing the update KB5009543 for devices running Windows 10 21H2, 21H1, and 20H2 with several fixes.
The update bumps the version to build 19042.1466 (20H2), 19043.1466 (21H1), and 19044.1466 (21H2), and according to the official notes, it fixes an issue that prevents Active Directory (AD) attributes from being written properly during a Lightweight Directory Access Protocol (LDAP) modify operation when you make multiple attribute changes. And it addresses a problem with the Japanese Input Method Editors (IME) that shows text out of order, or the text cursor might move unexpectedly in apps.
Also, the update KB5009543 fixes close to one-hundred vulnerability problems, which you can review in more detail at the Security Update Guide and the January 2022 Security Updates website.
The update download and install automatically, but you can always force it from Settings > Update & Security > Windows Updates and click the Check for Updates button. Alternatively, you can download the update KB5009566 directly from the Microsoft Update Catalog website.
It’s worth noting that version 2004 has reached the end of support on December 14, 2021, as a result, Microsoft is no longer offering updates for that release. If you are still on version 2004, it’s recommended to upgrade to Windows 10 21H2.
In addition, the company is also making available updates for older versions of Windows 10. For example, version 1909 received the update KB5009545 that increases the version number to build 18363.2037 and fixes several issues.
Windows 11 version 1809 gets the update KB5009557 that brings the version number to build 17763.2452 and delivers a few fixes.
In addition, version 1607 received the update KB5009546 (build 14393.4886) that addresses several problems with this release. Finally, Windows 10 version 1507 received the update KB5009585 that bumps the version number to build 10240.19177 and delivers some miscellaneous security improvements.
Uninstall update KB5009543
If the system update is causing issues, you can always uninstall it using these steps:
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Open Start on Windows 11.
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Search for Command Prompt, right-click the top result, and select the Run as administrator option.
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Type the following command to view the update history and press Enter:
wmic qfe list brief /format:table
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Check the Windows Update history of your device, and identify the update by its HotFixID and InstalledOn information.
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Type the following command to uninstall the update from your computer and press Enter:
wusa /uninstall /kb:5009543
Quick note: In the command, replace “5009543” for the KB number corresponding to the update you are trying to uninstall. -
Click the Yes button.
- 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 KB5009543, you can remove the update from the Advanced startup environment using these steps.
Mauro Huculak is a Windows expert and the Editor-in-Chief who started Pureinfotech in 2010 as an independent online publication. He is also been a Windows Central contributor for nearly a decade. Mauro has over 12 years of experience writing comprehensive guides and creating professional videos about Windows, software, and related technologies, 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 About.me.