Microsoft’s February cumulative update KB5077181 is leaving a significant number of Windows 11 devices unusable—driving endless restart loops, blocking sign‑ins with System Event Notification Service (SENS) errors, and corrupting network functionality—while Microsoft’s official advisory has not, at the time of reporting, acknowledged these specific failures. verview
KB5077181 was distributed on Patch Tuesday, February 10, 2026, as the monthly cumulative for Windows 11 and is delivered as a...