Windows 11 Update KB5077181 Triggers Boot Loops for Some Users, Fix Available
Some Windows 11 users began reporting boot loops, black screens, and sign-in failures after installing cumulative update KB5077181, released on February 10, 2026. The update included security patches, quality improvements, and new Secure Boot certificates, and installed without issues for most users. Microsoft has not officially confirmed widespread problems, but affected users have documented their experiences on forums and Microsoft's Q&A platform. Those impacted can remove the update using the DISM command-line tool via the Windows Recovery Environment, or attempt the graphical uninstall option under Advanced Recovery options. A separate issue involving corrupted Secure Boot keys has also been reported on select hardware, which may require resetting BIOS keys or updating firmware.
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