US EditionWindows 11 Boot Failures Tied to January Tied to Jan Updates
Some Windows 11 devices encounter startup failure after January 2026 updates, requiring manual recovery; Microsoft says only a limited number of devices are affected.
- Tuesday, Microsoft is investigating reports that its January 2026 security updates are leaving some Windows 11 machines stuck in a boot loop showing an `UNMOUNTABLE_BOOT_VOLUME` stop code and a black restart prompt.
- Reports first surfaced in user forums where machines stopped booting after the January 2026 updates; Microsoft says it has few reports and is still investigating.
- On affected machines running 24H2 and 25H2, engineers found systems cannot complete startup and require manual recovery, with no server editions affected and no reports on virtual machines.
- Affected users face downtime and manual repairs, and Microsoft urges customers and businesses experiencing failures to contact business support or submit reports through the Feedback Hub.
- The issue follows other January stability problems including a Secure Launch bug, Windows app credential failures, and an Outlook issue earlier this month, while Ask Woody notes unusual boot failure patterns.
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18 Articles
Microsoft admits Windows 11 update is nuking system drives, albeit there's a 'limited number of reports' of these disasters
Windows 11 runs into another disastrous bug with its latest update — Microsoft admits an 'issue in which devices are failing to boot', worryingly.
The nightmare of the Patch Tuesday of Windows 11 empire: Microsoft announces that some PCs may no longer start, the company has released two updates in a week to correct the problems caused Microsoft's Patch Tuesday is supposed to embody the reassuring routine of modern computer maintenance: regular, predictable, and seamless security fixes in professional environments as well as the general public. Yet, once again, this promise...
Microsoft Confirms Windows 11's January Update Is Bricking Some PCs
Microsoft's Windows 11 January 2026 Update woes continue, and now the company is confirming that some users are no longer able to boot their PCs, receiving the BSOD stop code "UNMOUNTABLE_BOOT_VOLUME" instead. The issue is limited to physical devices, and doesn't seem to impact virtual machines at all. But since this is the same update that
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