Windows 11 Patch Tuesday boot failure warning
Windows Central • • technology
Key Points:
- Microsoft has confirmed that some Windows 11 users are experiencing boot failures with the "UNMOUNTABLE_BOOT_VOLUME" stop code after installing the January 13, 2026 security update, resulting in a black screen and requiring manual recovery.
- The issue primarily affects physical machines running Windows 11 versions 24H2 and 25H2, with Microsoft currently investigating fixes and advising users to uninstall the update via the Windows Recovery Environment if affected.
- This boot problem adds to a series of critical bugs introduced by January's Patch Tuesday updates, including shutdown/hibernate failures on version 23H2, Remote Desktop sign-in issues on 24H2 and 25H2, and disruptions to cloud-backed apps like Outlook and One
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