Microsoft says it has resolved a Home windows 11 bug that prompted some industrial techniques to fail as well with an “UNMOUNTABLE_BOOT_VOLUME” error after putting in current safety updates, with the repair delivered within the February 2026 Patch Tuesday replace.
The boot concern, which Microsoft beforehand investigated and linked to failed December 2025 updates, affected a restricted variety of industrial Home windows 11 gadgets working variations 25H2 and 24H2.
Based on a personal enterprise advisory seen by Susan Bradley of Ask Woody, the difficulty has now been marked as absolutely resolved within the Home windows 11 KB5077181 safety replace launched on February 10, 2026.
Microsoft says impacted gadgets suffered boot failures after putting in the January 13, 2026, safety replace KB5074109 or later updates, displaying a black display screen and the message: “Your machine bumped into an issue and desires a restart. You’ll be able to restart.”
At that time, impacted techniques had been unable as well and required guide restoration to revive performance.
Microsoft beforehand confirmed the difficulty was brought on by the failed set up of the December 2025 safety replace, leaving gadgets in an improper state after the set up rolled again.
Making an attempt to put in future Home windows updates on gadgets with this “improper state” might trigger the system to grow to be unbootable.
Microsoft stated the difficulty affected solely bodily gadgets working Home windows 11 25H2 and 24H2, and didn’t obtain reviews of it affecting house customers or digital machines.
Repair delivered in February Patch Tuesday replace
Microsoft says it beforehand launched an preliminary decision within the non-obligatory non-security preview replace KB5074105 on January 29, 2026, which helped forestall further techniques from changing into affected by the bug.
The corporate now says the difficulty is absolutely resolved within the Home windows 11 KB5077181 replace launched throughout the February 2026 Patch Tuesday and later updates.
“This concern is absolutely resolved within the Home windows safety replace launched on February 10, 2026 (the Resolved KBs listed above), and later updates,” reads Microsoft’s advisory.
Sadly, gadgets that turned unbootable earlier than the repair was launched should still require further remediation.
Microsoft advises enterprise prospects whose gadgets stay affected to contact Microsoft Help for Enterprise for help restoring system stability.
It’s unclear why Microsoft didn’t share this advisory publicly, because it does for different recognized Home windows points.
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