New Windows 11 25H2 May 2026 Update – New Features in the Main Release (Build 26200.8457 or KB5089549)

In this article, we will talk about the latest Windows 11 Update for the 25H2 Main Release, which is the Build 26200.8457 or KB5089549.

For those of you who are not familiar with how Windows 11 Updates for the Main Release work, I will explain it to you in the following lines.

Every month Windows 11 has a B and a C Release for Windows 11. Usually, the B Release is launched on the second Tuesday of the month and contains all the features that were tested in the previous month’s C Release.

Microsoft is also announcing that starting with the January 2026 security update, Windows Server 2025 will have its own KB identifiers and build numbers. This change applies only to Windows Server 2025. It doesn’t change how you get or manage updates for Windows 11, version 24H2 or Windows 11, version 25H2.

New Improvements in this Update

• [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout. ​​​​​​​
• [Boot manager servicing update]
  • This update improves startup reliability after boot file updates, so devices start normally without entering BitLocker recovery.
  • (Known issue) Fixed: This update addresses an issue where some devices might enter BitLocker Recovery after updating boot files on systems with certain Trusted Platform Module (TPM) validation settings, including invalid PCR7 (Platform Configuration Register 7) configurations. This might occur after installing the April 2026 security update (KB5083769).
• [Connectivity] This update improves the reliability of Simple Service Discovery Protocol (SSDP) notifications to help prevent the service from becoming unresponsive.

For an in-depth list of other features and fixes that are rolling out, you can check this article.

Windows 11 Servicing Stack Update – 26100.8456

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. 

For more info about this Update, you can check this article from the Microsoft Blog.

For a more in-depth presentation of the New Update, you can watch the video below from the YouTube channel.