Windows 11 KB5077241 Adds Native Sysmon and Fixes BitLocker Reliability
Summary
Microsoft’s optional Windows 11 KB5077241 preview adds native Sysmon functionality, disabled by default, and fixes a BitLocker issue that could freeze devices after recovery-key entry. The non-security update also adds other quality improvements.
Key points
- KB5077241 is an optional February 2026 preview update; Microsoft says it does not include security fixes.
- The update adds native Sysmon functionality, which is disabled by default.
- Microsoft says the update fixes a BitLocker reliability issue that could freeze devices after recovery-key entry.
- Updated Secure Boot certificates are rolling out to replace 2011 certificates that expire in late June 2026.
- The update also adds a built-in network speed test and other Windows usability and management improvements.
Article Details
- Event Type
- Optional Windows 11 preview update release
- Impact
- KB5077241 provides 29 non-security quality improvements, including a BitLocker reliability fix addressing device freezes after recovery-key entry, a built-in network speed test, native Sysmon functionality disabled by default, and automatic Quick Machine Recovery for certain Windows 11 Pro devices. The update does not include security fixes.
Vendors
Products
BitLocker2026 preview update for Windows 11 that delivers 29 nonâsecurity quality improvements including BitLocker reliability fixes, a builtâin network speed test, and native Sysmon functionality.Quick machine recoveryfeatures such as Shift/middleâclick File Explorer instances, RSAT on Arm64, and automatic Quick Machine Recovery for certain Windows 11 Pro devices, and can be installed via Windows Update or the MicrosoftWindows 11Microsoft released KB5077241, an optional February 2026 preview update for Windows 11 that delivers 29 nonâsecurity quality improvements including BitLocker reliability fixes, a builtâin network speed test, and