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PC Gamer
PC Gamer
Andy Edser

Microsoft says the Windows 11 boot failure bug is linked to another buggy update: 'This issue can occur on devices that failed to install the December 2025 security update and were left in an improper state'

Microsoft Windows
Windows 11 Logo.

Well, don't I have egg on my face. After writing an article yesterday wherein I pointed out that Windows 11 is "currently in a reasonable state", it appears the OS now has something of a stacked bug problem.

We previously reported on a bug that Microsoft said was creating a "limited number of reports" over a boot failure issue, in which users were greeted with an "UNMOUNTABLE_BOOT_VOLUME" stop code after installing the January 2026 Windows security update (KB5074109).

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