Windows 11 KB5077181 fixes boot failures linked to failed updates

Microsoft says it has resolved a Windows 11 bug that caused some commercial systems to fail to boot with an "UNMOUNTABLE_BOOT_VOLUME" error after installing recent security updates, with the fix delivered in the February 2026 Patch Tuesday update. [...]

https://www.bleepingcomputer.com/news/microsoft/windows-11-kb5077181-fixes-boot-failures-linked-to-failed-updates/

Posted from: this blog via Microsoft Power Automate.