Windows 11 Update Warns of Boot Failures on Patch Tuesday
Microsoft has acknowledged issues stemming from the January 2026 security update for Windows 11, released on January 13. Users have reported boot failures that result in a stop code “UNMOUNTABLE_BOOT_VOLUME.” This issue has led to devices displaying a black screen with a restart message, preventing users from accessing their PCs.
Details of the Boot Failure Issue
The boot failure problem appears to affect users with Windows 11 versions 24H2 and 25H2, primarily on physical machines. While Microsoft has received limited reports, the specifics of the issue remain unclear. No explanation has been provided regarding the root cause or potential preventative measures.
Emergency Fixes and Recovery Steps
- Users may need to manually recover their PCs using the Windows Recovery Environment.
- It is recommended to uninstall the January 2026 security patch to regain access.
Moreover, this boot failure is the latest in a series of problems linked to January’s Patch Tuesday updates. Earlier reports indicated that some devices running version 23H2 failed to shut down or hibernate properly. Additionally, users of versions 24H2 and 25H2 faced sign-in issues with Remote Desktop.
| Issue | Version Affected | Status |
|---|---|---|
| Boot Failure | 24H2, 25H2 | Under Investigation |
| Shutdown/Hibernate Issues | 23H2 | Reported |
| Remote Desktop Sign-in | 24H2, 25H2 | Reported |
| Cloud-App Inoperability | All versions | Addressed via Updates |
Need for a Resolution
Given the severity of these issues, it is likely that Microsoft will have to issue another out-of-band update to address the boot failures. This ongoing situation raises questions about their current development quality and update processes.
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