KB5062649: Windows 10 Build 19045.6156 Introduces Extended Support Fix and Secure Boot Enhancements

New Windows 10 Release Preview Build 19045.6156 Unveiled for Insiders

Microsoft has officially introduced a fresh Windows 10 release preview build—version 19045.6156—under the update KB5062649. This rollout is aimed at participants in the Insider flighting program and brings a range of enhancements and fixes to improve user experience.

Key Updates and Fixes

Among the most significant updates is a corrective measure for the Extended Security Updates (ESU) enrollment wizard, a crucial tool for users seeking to secure their systems. This update addresses specific issues where users faced difficulty enrolling due to unexpected window closures.

Moreover, this build introduces enhancements concerning Secure Boot functionality, alongside Microsoft’s commitment to delivering crucial “stability fixes”following the latest Patch Tuesday updates.

Changelog Summary

ESU Enrollment Wizard Fix: The update resolves a key issue impacting users of the Windows 10 Extended Security Updates (ESU) enrollment wizard. Users previously encountered a problem where selecting “Enroll now” would cause the wizard to abruptly close after a brief loading period. This was attributed to incomplete application registration, which this update successfully rectifies, ensuring a more reliable enrollment process.

[Mobile Operator Profiles] Updated: Enhancements to the Country and Operator Settings Asset (COSA) profiles improve user management capabilities.
[Secure Boot] New Feature! This update introduces the capability to deploy WeUSiPolicy VBS Anti-rollback protections through the Secure Boot AvailableUpdates registry key, thereby reinforcing system security during updates.
[Stability Fix] This update addresses rare stability issues that arose following the May 2025 security update, which had caused some devices to become unresponsive under specific scenarios.

For more details, visit the official announcement blog post here on Microsoft’s website.

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