Microsoft Windows 11 24H2 Update Version OS Builds 26200.8457 and 26100.8457

KB5089549 updates Windows 11 version 25H2 and 24H2 to OS Builds 26200.8457 and 26100.8457 with the latest security fixes, quality improvements, Secure Boot rollout changes, and a servicing stack update. It also addresses BitLocker recovery after boot file updates and includes a known install issue fixed by KB5089573. Reference IDs: KB5083769, KB5083631, KB5092762.

• Includes the latest security fixes and addresses vulnerabilities documented in the May 2026 Security Updates guide.
• Improves Secure Boot certificate deployment by adding higher-confidence device targeting data and phased rollout controls.
• Adds a new C:\Windows\SecureBoot folder on eligible devices with scripts for Secure Boot certificate status detection and automated deployment.
• Fixes a boot manager servicing issue that could cause BitLocker Recovery after boot file updates on systems with certain TPM validation settings and invalid PCR7 configurations.

• Improves startup reliability after boot file updates so devices start normally without entering BitLocker recovery.
• Improves reliability of SSDP notifications to help prevent the service from becoming unresponsive.
• Adds support for the 2023 daylight saving time change for the Arab Republic of Egypt.

• Adds a new C:\Windows\SecureBoot folder on eligible devices containing example scripts for Secure Boot certificate management.
• Introduces additional high-confidence device targeting data to expand automatic Secure Boot certificate coverage.
• Includes AI component updates for Image Search, Content Extraction, Semantic Analysis, and Settings Model.

• Some devices may fail to install the update with error 0x800f0922 when the EFI System Partition has very limited free space, especially 10 MB or less.
• The installation may fail during restart at about 35–36% completion and roll back with the message 'Something didn’t go as planned. Undoing changes.'

• This update includes changes from April 14, 2026—KB5083769 and April 30, 2026—KB5083631 Preview.
• If previous updates are already installed, only the new changes in this package will be downloaded and installed.
• The servicing stack update included is KB5092762 for OS Build 26100.8456.
• Microsoft notes that Secure Boot certificates used by most Windows devices are set to expire starting in June 2026; administrators should review the certificate update guidance.
• The known install issue is addressed in KB5089573.

• KB5089549 release notes
  https://support.microsoft.com/help/5089549
• Fix for 0x800f0922 install issue
  https://support.microsoft.com/help/5089573

Product Information

Vendor: Microsoft

Product: Windows 11

Version: OS Builds 26200.8457 and 26100.8457

Release date: May 12, 2026