Windows 11’s recent update, KB5094126 (Build 26200.8655), released on June 9, 2026, has stirred considerable concern among users, particularly those operating business devices. This update, while designed to address approximately 200 security vulnerabilities—including critical flaws and zero-day exploits—has inadvertently led to significant operational disruptions. Reports indicate that certain PCs are experiencing boot failures, blue screens, and loops requiring BitLocker recovery.
PCs no longer boot or end up in BitLocker Recovery
Users have reported that after applying the update, their Windows 11 systems fail to start normally. Instead, they encounter blue screens or are prompted to enter a BitLocker recovery key. This issue is not isolated to Windows 11; some Windows 10 users are facing similar challenges, albeit for different reasons. Affected devices include a range of business models from manufacturers such as HP and Dell:
- HP EliteBook 840 G10
- HP ProBook 460 G11
- HP Engage One Pro 15.6 G2 AiO
- HP ZBook
- Dell Precision (including 7530)
In several instances, devices have become trapped in a boot loop, complicating recovery efforts.
Secure Boot and EFI partition
The underlying issue appears to stem from modifications in Secure Boot and the EFI system partition. The update refreshes Secure Boot certificates and installs new boot components. However, systems with limited EFI partition space—sometimes as small as 100 MB—may not accommodate these changes. Windows event logs have indicated TPM-WMI errors, highlighting insufficient space in the EFI partition. HP devices may be particularly susceptible, as firmware and recovery data often reside in the EFI partition, consuming additional space.
In severe cases, Secure Boot may prevent the system from starting altogether, resulting in error code 0xc0430001 and triggering BitLocker recovery.
Workaround
For those affected, a potential workaround has emerged involving adjustments in the BIOS:
- Have your BitLocker recovery key ready.
- Access the BIOS/UEFI (on many HP devices, press Esc during startup).
- Disable Secure Boot.
- Start Windows and allow the update to complete.
- Re-enable Secure Boot afterward.
Additionally, users are encouraged to ensure their BIOS or UEFI is updated to the latest version, as outdated firmware may contribute to these issues.
OneDrive and cloud services partially disrupted
In the wake of the KB5094126 update, some users have reported difficulties with OneDrive. Instances have arisen where OneDrive fails to open correctly from File Explorer, and access via the sidebar or system tray becomes unresponsive. Users have noted that clicking the cloud storage icon may yield no response at all.
While Dropbox and iCloud Drive have also encountered isolated issues, these reports are less frequent. Notably, files remain accessible through direct user folders, indicating that the problem primarily affects File Explorer integration.
Word integration and desktop customizations
The update has also disrupted the integration of Microsoft Word with third-party software in specific enterprise environments, particularly in sectors such as healthcare and accounting where Word is utilized for document creation. Although Word continues to function, automated workflows may occasionally fail.
Moreover, modifications to the desktop.ini file have resulted in customized folder views or icons not displaying correctly if classified as untrusted.
Microsoft has not yet made an official statement
As of now, Microsoft has not confirmed these issues. However, reports from users on platforms like the Feedback Hub and Reddit continue to accumulate. The timeline for a fix or an official response from Microsoft remains uncertain.
