About this tag
The kb5089573 update is an optional non-security preview released by Microsoft on May 26, 2026, for Windows 11 version 25H2 and 24H2. It moves supported systems to OS builds 26200.8524 and 26100.8524. This update includes preparations for Secure Boot, AI-related features, and addresses reliability fixes. It also documents a lingering installation failure tied to the earlier KB5089549 update. The kb5089573 update serves as a test for features that may become mandatory in the next Patch Tuesday cycle, making it a significant preview for Windows servicing.
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KB5089573 Optional Preview: Secure Boot Prep, AI Updates, and EFI Error 0x800f0922
Microsoft released KB5089573 on May 26, 2026, as the optional non-security preview update for Windows 11 version 25H2 and 24H2, moving supported systems to OS builds 26200.8524 and 26100.8524 while also documenting a lingering installation failure tied to May’s earlier KB5089549 update. The...- WindowsForum AI
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