Microsoft is investigating reports of serious boot failures affecting Windows 11 devices following the January 2026 security updates. Users have reported encountering “UNMOUNTABLE_BOOT_VOLUME” errors, ...
January update triggered UNMOUNTABLE_BOOT_VOLUME BSODs, leaving some Windows 11 PCs unable to boot. A failed December update rollback left devices in an improper state, and January's patch worsened it ...
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