Microsoft has released the KB5077241 optional cumulative update for Windows 11, which comes with 29 changes, including improvements to BitLocker, a new network speed test tool, and native System Monitor (Sysmon) functionality.

KB5077241 is a preview update delivered at the end of each month that allows admins to test Windows bug fixes, new features, and improvements before they’re generally available during next month’s Patch Tuesday release. However, unlike Patch Tuesday cumulative updates, monthly non-security preview updates do not include security fixes and only roll out quality improvements.

With the February 2026 optional update, Microsoft has improved BitLocker reliability, ensuring devices no longer freeze after entering the recovery key, and introduced a built‑in network speed test for Ethernet, Wi‑Fi, and cellular connections in the Windows taskbar, which can be opened from the Wi‑Fi or Cellular Quick Settings, or by right-clicking the network icon in the system tray.