"On the reboot, my Secure Boot flagged me that the keys were corrupted," the user said. One user said the update corrupted the secure boot keys and locked the user out of the computer. The UEFI Secure Boot feature prevents unsigned or untrusted code (such as bootkits) from running during boot.Īfter users complained their devices became unusable after installing security update KB4524244 for Windows 10, Microsoft decided to pull KB4524244 and KB4502496-which addressed the same issue for Windows 8.1, Windows Server 2012, and an earlier version of Windows 10. UEFI connects the computer's firmware to the operating system and is in charge of code that runs when the system first boots up. The update, which was part of Microsoft's normal Patch Tuesday release this month, fixed a security vulnerability affecting third-party Unified Extensible Firmware Interface (UEFI) boot managers. Microsoft has removed the Windows security update addressing issues with third-party boot managers after users complained the updates caused their systems to stop working.
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