This article describes the protection against the publicly disclosed Secure Boot security feature bypass that uses the BlackLotus UEFI bootkit tracked by CVE-2023-24932, how to enable the mitigations, and guidance on bootable media.

"Bootmgr is missing Press Ctrl+Alt+Del to restart" error when you start Windows - Microsoft Support. Windows 10 Pro released in July 2015 Windows Vista Starter More... This error indicates that the boot sector is damaged or missing. Resolution. To fix this, use the following methods to troubleshoot this Windows Start error.

This article talks about how to use the Bootrec.exe tool in the Windows RE to troubleshoot and repair the following items in Windows Vista or Windows 7: A master boot record (MBR) A boot sector. A Boot Configuration Data (BCD) store.

Cause. This issue occurs because the boot manager compares two device signatures incorrectly. These device signatures are the Extensible Firmware Interface (EFI) device signature that is in the extended boot record (EBR) and the device signature that is in the master boot record (MBR).

Summary. To help keep Windows devices secure, Microsoft adds vulnerable bootloader modules to the Secure Boot DBX revocation list (maintained in the system UEFI-based firmware) to invalidate the vulnerable modules.

Summary. This update makes improvements to the Windows recovery features for Windows 11, version 21H2. Note This compatibility update is included in KB5034440: Windows Recovery Environment update for Windows 11, version 21H2: January 9, 2024.

This article describes an issue in which Trusted Platform Module (TPM) lockout occurs unexpectedly in Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2. An update is available to fix this issue. Before you install this update, see the Prerequisites section.

How to obtain and install the update. Method 1: Windows Update. This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see. Get security updates automatically.

Windows 7. Windows 8.1. Windows 10 (Then select Download now.) Windows 11 (Then select Download now .) Important: Back up your files before you install or reinstall Windows on your PC. Learn how. To create the installation media, here's what you'll need: A PC with a reliable internet connection.