Windows 11 KB5077241 update improves BitLocker, adds Sysmon tool

Bleeping Computer

by Sergiu Gatlan

February 25, 2026

AI-Generated Deep Dive Summary

Microsoft has released the KB5077241 optional cumulative update for Windows 11, bringing significant improvements to security and system performance. This preview update, part of the monthly non-security updates for February 2026, includes enhanced BitLocker reliability, a new network speed test tool, and the introduction of native System Monitor (Sysmon) functionality. Additionally, it improves wake-from-sleep performance under heavy load and introduces the ability to set WebP images as desktop backgrounds. For security professionals, this update marks a critical enhancement with improved BitLocker reliability, addressing issues where devices previously froze after entering recovery keys. The addition of Sysmon, a powerful tool for monitoring system processes, further strengthens Windows' security capabilities. These updates are particularly valuable for organizations relying on BitLocker for device protection and for those looking to streamline their system monitoring processes. The update also introduces a built-in network speed test tool accessible from the taskbar, providing users with quick insights into their connection speeds across Ethernet, Wi-Fi, and cellular networks. Other notable improvements include faster resume times after sleep mode and the ability to open new File Explorer instances using keyboard shortcuts or mouse gestures. IT administrators can now access Remote Server Administration Tools (RSAT) on Arm64 devices, expanding their capabilities for managing remote servers. This update underscores Microsoft's ongoing efforts to enhance Windows 11's security and usability. While it is a preview release available through Windows Update, users can manually install it from the Microsoft Update Catalog if desired. The inclusion of features like the redesigned Start menu and updated battery icons reflects Microsoft's commitment to refining user experience while addressing critical system needs. Overall, KB5077241 offers a mix of practical improvements for everyday use and significant updates for security and administration. Its focus on BitLocker

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Originally published on Bleeping Computer on 2/25/2026