KB5062649: Adds the ability to deploy SKUSiPolicy VBS Anti-rollback protections through the Secure Boot

July 22, 2025—KB5062649 (OS Build 19045.6159) Preview

Summary
This preview update contains the fixes and quality improvements contained in the following update:
July 8, 2025—KB5062554 (OS Builds 19044.6093 and 19045.6093)
The following is a summary of the key issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.

• ​​​​​[Extended Security Updates] Fixed: An issue impacting the Windows 10 Extended Security Updates (ESU) enrollment wizard. Some users experienced a problem where clicking “Enroll now” caused the wizard window to open, begin loading, and then close unexpectedly. This occurred due to incomplete app registration, which prevented the wizard from loading correctly. This update addresses that issue to ensure a smoother enrollment experience.
• [Mobile Operator Profiles] Updated: Country and Operator Settings Asset (COSA) profiles.
• [Secure Boot] New! Adds the ability to deploy SKUSiPolicy VBS Anti-rollback protections through the Secure Boot AvailableUpdates registry key.
• [Core File Systems] Fixed: An issue observed in rare cases after installing the May 2025 security update and subsequent updates causing devices to experience stability issues. Some devices became unresponsive and stopped responding in specific scenarios.

1. Fixed: A known issue with the Microsoft Changjie Input Method. Users were unable to select words after a recent update.
2. Fixed: A known issue when searching for an emoji in the emoji panel. After a recent update, the search always returns no results.
3. ​​​​​​​Fixed: An issue in which phonetic input methods, including the Hindi Phonetic Input keyboard and Marathi Phonetic keyboard do not work correctly after a recent update.