Microsoft has confirmed that the boot failures with its January 2026 Windows 11 update are limited to “commercial” PCs and happened due to the December 2025 update failing to install and PCs being ...

Microsoft has linked recent reports of Windows 11 boot failures after installing the January 2026 updates to previously failed attempts to install the December 2025 security update, which left systems ...

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 ...

A series of Windows 11 boot issues reported by users seems to have a root cause that stems from a bad December software update that was pushed out. According to Microsoft, a bad January update ...