Windows 11 KB5077181 fixes boot failures linked to failed updates
ID: 5866a7b9-1386-5639-aa8b-e78ae9407170
STIX ID: report--5866a7b9-1386-5639-aa8b-e78ae9407170
Feed Name: Bleeping Computer
Microsoft resolved a Windows 11 boot failure bug affecting a limited set of commercial physical devices on versions 25H2 and 24H2 that became unbootable (UNMOUNTABLE_BOOT_VOLUME) after failed December 2025 updates; an initial mitigation shipped in preview KB5074105 (Jan 29, 2026), and the issue is now fully fixed in the February 10, 2026 Patch Tuesday security update KB5077181, though previously impacted systems may still need manual recovery or assistance from Microsoft Support for Business.
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