Windows 11 January 2026 updates may cause boot failures on some PCs. Microsoft is investigating issues linked to KB5074109.
Microsoft is investigating reports that some Windows 11 devices are failing to boot with "UNMOUNTABLE_BOOT_VOLUME" errors ...
Windows 11’s latest update drama: KB5074109 breaks things, and the uninstall process breaks too.
Struggling with the Windows 11 "Windows Update" Catalog Error? Discover proven, step-by-step fixes to get your updates ...
Windows 11 KB5074109 is now available for Windows 11 25H2 and 24H2. This release mostly has bug fixes and improvements.
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