Microsoft investigates Windows 11 boot failures after January updates
ID: 48a49d33-16a0-58b2-873f-74b48d88c2ad
STIX ID: report--48a49d33-16a0-58b2-873f-74b48d88c2ad
Feed Name: Bleeping Computer
Microsoft is investigating reports that the January 2026 Windows 11 security updates (KB5074109) are causing some physical devices on versions 24H2 and 25H2 to fail to boot with an "UNMOUNTABLE_BOOT_VOLUME" error, requiring manual recovery; users are asked to submit Feedback Hub reports while the company analyzes whether the update caused the regression, and an out-of-band fix was also issued for Outlook freezes with PSTs in cloud storage.
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