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Windows 11 KB5094126: Major Update Causes BSODs, Boot Failures, and Other Issues
Windows 11 KB5094126, released as part of the June 2026 Patch Tuesday cycle, is the most significant update of the year, introducing several new features, including the highly anticipated Low Latency Profile. However, numerous reports suggest this update is causing severe boot failures such as BSODs (Black Screen of Death) and BitLocker Recovery screens, particularly on HP devices. Additionally, the update appears to disrupt cloud sync functionality in File Explorer.
Key Details About KB5094126
Released on June 9, 2026, KB5094126 (Build 26200.8655) includes fixes for up to 200 security vulnerabilities, including 33 critical and five zero-day bugs. It installs automatically unless deferred by the user. Despite its importance, the rollout has created significant issues for many users.
Reported Problems
- Boot failures on HP devices, including the EliteBook 840 G10, resulting in BSODs or BitLocker recovery screens.
- Cloud sync disruptions in File Explorer for services like OneDrive, Dropbox, and iCloud Drive.
- Breakage in Microsoft Word integration for certain business applications.
- Changes to desktop.ini behavior, affecting custom folder icons.
Why Is KB5094126 Causing Boot Failures?
The update appears to affect Secure Boot-related files, certificates, Boot Manager, or EFI contents. Devices with older images using a 100MB EFI partition (instead of the newer 500MB–1GB partitions) are particularly vulnerable. Insufficient disk space in the EFI partition can prevent Windows from writing necessary files, leading to boot failures.
HP devices are disproportionately affected because they store BIOS or firmware recovery files within the EFI partition, consuming significant space. This issue is compounded by a potential compatibility problem between the update and BIOS or EFI/System partition settings misconfigured by HP.
Common Symptoms
- Black Screen of Death (BSOD) with error 0xc0430001.
- Secure Boot signature verification errors.
- BitLocker recovery mode activation, requiring a recovery key.
Event Viewer Logs
On affected devices, Event Viewer often displays TPM-WMI errors, including messages like: “The secure boot update failed to update Boot Manager (2023) due to the error: insufficient disk space.”
Microsoft’s Role
Microsoft has acknowledged that KB5094126 activates the Secure Boot certificate update on most supported PCs. While this aligns with the observed issues, the underlying problem appears to be a mismatch between the update and certain BIOS/EFI configurations, particularly on HP machines.
How to Resolve Boot Failures
If your PC is stuck in a recovery loop or fails to boot, the following steps may help:
- Temporarily disable Secure Boot in BIOS/UEFI settings to regain access to Windows.
- Update your BIOS/UEFI firmware to the latest version.
- Check if your EFI partition has sufficient free space. If not, resize it to meet the required capacity.
- If none of the above work, consider uninstalling the KB5094126 update until a patch is released.
File Explorer and Cloud Sync Issues
Users have reported that KB5094126 disrupts OneDrive integration in File Explorer. After the update, clicking OneDrive icons in the system tray or File Explorer fails to open the folder. Similar issues have been observed with Dropbox and iCloud Drive, though to a lesser extent.
Temporary Workarounds
- Switch to a Microsoft account and enable UAC (User Account Control).
- Uninstall KB5094126 and wait for a future patch to address the issue.
Word Integration Issues in Business Applications
The update has broken Microsoft Word integration in certain line-of-business applications, such as dental and accounting software. While Word itself functions normally, apps that embed or automate Word are failing to operate correctly.
Resolution
Uninstalling KB5094126 appears to resolve the issue for affected applications. Navigate to Windows Update > Update History > Uninstall Updates, select KB5094126, and reboot your system.
New Restrictions on desktop.ini
Microsoft has introduced changes to how Windows handles desktop.ini files, which are used to customize folder appearances. Post-update, the OS now requires that these files originate from a trusted source, breaking folder customizations for files downloaded or created using third-party apps.
How to Restore Functionality
Run the following PowerShell commands to trust a specific desktop.ini file:
Command to unlock a single file:
(Insert specific PowerShell command here)
Command to unlock all files in a folder:
(Insert specific PowerShell command here)
While this change enhances security, it has disrupted workflows for advanced users relying on desktop.ini for folder personalization.
Conclusion
Windows 11 KB5094126 introduces essential security updates but has caused significant disruptions, particularly on HP devices. Users encountering issues are encouraged to follow the provided workarounds or uninstall the update until Microsoft releases a fix. With widespread reports from users and platforms like Reddit and Feedback Hub, Microsoft is likely to acknowledge and address these problems in the near future.
