Windows 11 update KB5094126 is causing serious problems for some PCs, including boot failures, blue screens, BitLocker recovery prompts, and issues with OneDrive inside File Explorer. The update was released on June 9, 2026, and is considered important because it patches around 200 security vulnerabilities, but reports suggest it is also breaking startup on certain systems.
The problem appears to affect some business PCs more than typical home devices. Reported models include HP EliteBook, HP ProBook, HP ZBook, HP Engage systems, and Dell Precision workstations. In the worst cases, affected PCs can get stuck in a boot loop or land on a BitLocker recovery screen that asks for the recovery key.
Microsoft has not officially confirmed the issue yet. However, user reports are appearing through Feedback Hub, Reddit, and other support channels, which suggests the problem is not isolated.
Why the Windows 11 update may be causing boot failures
The issue appears to be connected to Secure Boot and the EFI system partition. KB5094126 refreshes Secure Boot certificates and writes new boot related components to the system.
On some PCs, the EFI partition may be too small to handle the new files. Some systems reportedly have EFI partitions as small as 100MB, and that may not leave enough space for the update to complete cleanly.
When that happens, Windows may fail to start properly. Some PCs show blue screens, while others trigger BitLocker recovery. In some cases, logs reportedly show TPM WMI errors tied to insufficient EFI partition space.
HP systems may be more exposed because some models store firmware and recovery related files inside the EFI partition, leaving even less free space.
| Reported issue | What users may see |
|---|---|
| Boot failure | Windows does not start normally |
| BitLocker recovery | PC asks for a recovery key |
| Blue screen | System crashes during startup |
| Boot loop | Device repeatedly fails to complete startup |
| EFI partition problem | Not enough space for updated boot files |
| Secure Boot conflict | Startup may be blocked after certificate changes |
Which PCs appear to be affected
The reports mention several business focused devices from HP and Dell. These include HP EliteBook 840 G10, HP ProBook 460 G11, HP Engage One Pro 15.6 G2 AiO, HP ZBook models, and Dell Precision systems including the Precision 7530.
That does not mean every device from those lines will fail. The issue likely depends on firmware version, partition layout, Secure Boot configuration, BitLocker status, and how much free space exists in the EFI partition.
Still, business users and IT teams should treat this update carefully, especially on managed fleets where BitLocker is enabled by default.
A temporary workaround may help some affected PCs
Some affected users say they were able to work around the startup issue by changing Secure Boot settings in the BIOS or UEFI. This should be done carefully, especially on work devices.
Before trying any fix, make sure you have the BitLocker recovery key. Without it, you may not be able to unlock the drive if Windows asks for recovery verification.
The reported workaround is to enter BIOS or UEFI during startup, disable Secure Boot, let Windows finish the update process, then re enable Secure Boot afterward. On many HP devices, the BIOS menu can be opened by pressing Esc during startup.
Updating the BIOS or UEFI firmware may also help, especially if the system is running an older firmware version.
OneDrive and File Explorer are also affected for some users
The update is not only causing startup problems. Some people also report that OneDrive no longer opens correctly from File Explorer after installing KB5094126.
The sidebar shortcut or system tray icon may become unresponsive, while the actual files may still be accessible through the direct user folder. That suggests the issue is mainly tied to File Explorer integration rather than file loss.
There are also fewer reports involving Dropbox and iCloud Drive, although those appear less common. For people who rely heavily on cloud storage integration, this can still create daily workflow problems.
Word automation and folder customizations may also break
Some enterprise users are reporting problems with Microsoft Word integration in third party software. This is mainly relevant in workplaces where medical, accounting, or document management apps use Word in the background to generate files.
Word itself may still open normally, but automated workflows can fail. That can become a bigger issue for businesses that depend on document templates or embedded Word processes.
The update also appears to change how Windows handles desktop.ini files. Customized folder views or icons may stop showing correctly if Windows treats the file as untrusted.
What Windows 11 users should do now
KB5094126 is an important security update, but the boot problems make it risky for some machines. If you manage business PCs, it may be safer to test the update on a small number of devices before deploying it widely.
If the update is already installed and your PC works normally, there may be nothing to do. But it is still wise to keep your BitLocker recovery key saved somewhere safe and check whether your device has a BIOS or UEFI update available.
If your PC fails to boot after the update, do not wipe the device immediately. Check for BitLocker recovery options, try the Secure Boot workaround only if you understand the risk, and contact your IT admin if the PC is managed by an organization.
Microsoft has not yet issued an official fix or statement. Until then, affected users may need to rely on temporary workarounds while waiting for a clearer repair path.
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