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Windows 11 update is breaking some PCs with boot and BitLocker issues

Microsoft’s June 2026 cumulative update KB5094126 (Builds 26200.8655 and 26100.8655) is causing critical issues on some Windows 11 PCs, including BSODs, forced BitLocker recovery loops, and broken OneDrive functionality. Problems span consumer and enterprise devices, with reports of Secure Boot errors and EFI partition conflicts. Microsoft has not yet confirmed a fix, leaving affected users stuck in recovery modes. The update was released on June 9, 2026, as part of Patch Tuesday.

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What changed

New reports confirm the update is worsening boot failures and BitLocker issues beyond initial forum discussions, now affecting HP and Dell enterprise systems.

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  1. Windows 11 KB5094126 update triggers BSODs, boot failures, BitLocker lockouts

    Microsoft’s June 2026 cumulative update KB5094126 (Builds 26200.8655 and 26100.8655) is causing critical issues on some Windows 11 PCs, including BSODs, forced BitLocker recovery loops, and broken OneDrive functionality. Problems span consumer and enterprise devices, with reports of Secure Boot errors and EFI partition conflicts. Microsoft has not yet confirmed a fix, leaving affected users stuck in recovery modes. The update was released on June 9, 2026, as part of Patch Tuesday.

    What's confirmed:

    • Windows 11 update KB5094126 is forcing BitLocker recovery loops on affected PCs, preventing users from accessing encrypted drives without manual intervention.
    • The update is causing blue screens (BSODs) with error code 0xc0430001, particularly on systems with Secure Boot enabled.
    • OneDrive functionality is broken in File Explorer on some systems after installing KB5094126, with sync errors and app crashes reported.
    • Boot failures and Secure Boot errors are being reported on HP and Dell business devices, with some users unable to start their PCs.
    • The update was released on June 9, 2026, as part of Microsoft’s June 2026 Patch Tuesday and applies to Windows 11 versions 25H2 and 24H2.
    • Some users are experiencing EFI partition space issues as a secondary effect of the update, complicating recovery attempts.

    Still unconfirmed:

    • Microsoft may be partially to blame for the issues, though some reports suggest OEMs like HP and Dell have contributed through separate BIOS or driver updates.
    • A potential fix or rollback tool for KB5094126 is expected but has not been officially released by Microsoft as of June 18, 2026.
    • The update is reportedly patching around 200 security vulnerabilities, but the side effects have overshadowed its intended benefits.
    • Secure Boot key expirations may be indirectly linked to the boot failures, though no direct evidence confirms this as the primary cause.
    confidence 92%