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Boot Failure

All articles tagged with #boot failure

technology10 days ago•3 min saved

Microsoft patches Windows 11 boot failure with February 2026 KB5077181

Microsoft says a Windows 11 boot bug that caused UNMOUNTABLE_BOOT_VOLUME errors on some commercial devices after security updates is fully fixed with the February 2026 Patch Tuesday security update KB5077181. The issue, tied to December 2025 updates and worsened by January 2026 KB5074109 (and related updates), affected Windows 11 25H2 and 24H2 on physical devices, not home users or virtual machines; an initial mitigation arrived in KB5074105 on Jan 29. Devices already unbootable before the fix may still need remediation, and enterprise customers should contact Microsoft Support for Business for assistance.

via BleepingComputer|

#boot-failure #enterprise #patch-tuesday

technology26 days ago•4 min saved

Microsoft ties Windows 11 boot issues to December 2025 patch rollback

Microsoft says recent Windows 11 boot failures after the January 2026 updates are linked to devices that previously failed to install the December 2025 security update and were rolled back, leaving the system in an “improper state” that can prevent boot when applying new updates. The issue affects physical devices on Windows 11 versions 25H2 and 24H2; the BSOD stop error is UNMOUNTABLE_BOOT_VOLUME. A partial fix is being developed to stop new no-boot scenarios, but it won’t repair already-bootless machines or prevent the improper state from forming. The cause and scope are still under investigation, with no VM impact reported at this time.

via BleepingComputer|

#boot-failure #december-2025-update #technology

technology1 month ago•2 min saved

Windows 11 2026 Update Chaos Spurs Emergency Patches and Boot Problems

Microsoft’s January 2026 Windows 11 update caused shutdown crashes and boot failures, prompting a second out-of-band patch to fix OneDrive/Dropbox crashes and leaving IT admins bracing for potential further issues.

via The Verge|

#boot-failure #emergency-patch #enterprise-it

technology1 month ago•7 min saved

Windows 11 January 2026 Update Triggers Boot Failures on Some PCs, Prompting Emergency Fix

Microsoft says a limited number of devices on Windows 11 24H2/25H2 may fail to boot after installing the January 2026 security update KB5074109, showing a black screen with the UNMOUNTABLE_BOOT_VOLUME stop code. Recovery may be needed via Windows Recovery or a clean install using an ISO; the issue appears limited to certain hardware. An emergency out-of-band update KB5078127 has been released to fix related problems (e.g., Outlook Classic and other app issues), but some glitches remain. If you’re not experiencing issues, no action is required.

via Windows Latest|

#boot-failure #kb5074109 #kb5078127

technology1 month ago•3 min saved

Microsoft probes Windows 11 boot crash tied to January 2026 updates

Microsoft is investigating reports that some Windows 11 devices (versions 25H2 and 24H2 after KB5074109) fail to boot with the UNMOUNTABLE_BOOT_VOLUME error following the January 2026 security updates. Affected systems display a black crash screen and require manual recovery; reports are limited to physical devices so far. Microsoft is collecting feedback via the Feedback Hub and will confirm if the issue is a Windows update regression; no virtual machine reports have been noted.

via BleepingComputer|

#boot-failure #kb5074109 #patch-tuesday

technology1 month ago•47 min saved

January 2026 patch risks booting on some Windows 11 PCs

Microsoft says a subset of Windows 11 devices may fail to boot after installing the January 2026 security update (KB5074109), showing a black screen with the UNMOUNTABLE_BOOT_VOLUME stop code. The company has released emergency out-of-band updates and advises using the Windows Recovery Environment to uninstall the patch for recovery. This issue follows a spate of Patch Tuesday bugs affecting various Windows versions, with Microsoft investigating fixes and workarounds.

via Windows Central|

#boot-failure #kb5074109 #patch-tuesday