Windows 10 ESU January 2026 Update: KB5073724 (Build 19045.6809) Released

Windows 10 ESU January 2026 Update: KB5073724 (Build 19045.6809) Released

Windows 10 22H2 Update Overview

The latest update for Windows 10 22H2, designated as build 19045.6809 (KB5073724), is part of the Extended Security Updates (ESU) program. This update, rolling out as of January 13, 2026, introduces essential modifications, including the removal of outdated drivers and solutions for Secure Boot certification challenges.

Key Features of the January 2026 Update

While the update does not include any substantial new features—due to the end of mainstream support on November 14, 2025—it does address various compatibility and security issues. Here are the primary fixes and improvements:

  • Driver Updates: The update removes legacy modem drivers such as agrsm64.sys (x64), agrsm.sys (x86), smserl64.sys (x64), and smserial.sys (x86).Users relying on these drivers may experience functionality loss for their respective modem hardware.
  • Secure Boot Enhancements: This update includes refined algorithms for identifying devices that qualify for automatic Secure Boot certificate updates, enhancing the overall security for systems undergoing updates.
  • WinSqlite3.dll Security Fix: The update also patches a vulnerability by upgrading the WinSqlite3.dll core component, which had been flagged by some security applications.

Updates for Older Versions of Windows 10

In tandem with the 22H2 update, Microsoft is also providing patches for older Windows 10 versions, including 1809 and 1607. The KB5073723 update for version 1809 increases the build number to 17763.8276, while KB5073722 for version 1607 brings the build to 14393.8783, offering additional fixes for these systems.

Installing the January 2026 Patch Update

To initiate the download and installation process for the Windows 10 build, navigate to the “Windows Update” section in your settings and click the “Check for Updates” button.

Update History Highlights

  • Patch Tuesday Final Release:
    • Windows 10 22H2 build 19045.6809 was released on January 13, 2026. For further details, consult the official notes.
    • Windows 10 21H2 build 19044.6809 was released on the same date.(Same).

Understanding Windows 10’s End of Support

As of November 14, 2025, support for Windows 10 has officially ended, meaning the cessation of security updates, bug fixes, and technical support from Microsoft. For users who need critical security updates, enrollment in the Extended Security Updates (ESU) program is necessary.

Failing to receive these updates can expose systems to security vulnerabilities and may degrade performance over time. Users are strongly encouraged to consider upgrading to Windows 11 or alternatively, exploring other operating systems such as Linux Mint.

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Extended Support for Windows 10 Versions

If you wish to maintain access to Windows 10, Microsoft currently offers the Extended Security Updates (ESU) program. Initially designed for organizations that continue to use older operating systems, it is now available to everyday consumers as well.

It’s vital to recognize that all Windows 10 versions have reached the end of life, including but not limited to:

  • Version 1507 (RTM)
  • Windows 10 2015 LTSB
  • Version 1511
  • Version 1607
  • Version 1703
  • Version 1709
  • Version 1803
  • Version 1809
  • Version 1903
  • Version 1909
  • Version 2004
  • Version 20H2
  • Version 21H1
  • Version 22H2

For detailed information, visit Microsoft’s service agreement.

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