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. Applies To. 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.

Fixes an issue in which a computer crashes in the BIOS on a Windows 8.1 or Windows Server 2012 R2-based computer.

Installation media, such as a USB flash drive, can be used to install a new copy of Windows, perform a clean installation of Windows, or reinstall Windows. To create installation media, go to the software download website, where step-by-step instructions can be found.

Fixes an issue in the Cdboot.efi, Cdboot_noprompt.efi, Efisys.bin, and Efisys_noprompt.bin files that causes a "Boot failed" error message. This issue occurs when you start a UEFI-enabled computer from the installation DVD of a 64-bit version of Windows 7 or Windows Server 2008 R2.

You attach a storage device that has more than four partitions to a computer that has the Unified Extensible Firmware Interface (UEFI) mode enabled. You insert a Windows 7 or Windows Server 2008 R2 installation DVD into a drive of the device, and then you start the computer from the DVD.

To run the Bootrec.exe tool, first start the Windows RE: Put the Windows Vista or Windows 7 media in the DVD drive, and then start the computer. Press a key when you are prompted. Select a language, a time, a currency, a keyboard, or an input method, and then click Next. Click Repair your computer.

An update is available to fix this issue. Before you install this update, see the Prerequisites section. Note This update is re-released on October 13, 2015, with a smaller boot loader file bootmgfw.efi. Symptoms. When this issue occurs, applications that depend on TPM won't function until you reset the TPM lockout.

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.

This article describes a hotfix that adds support for Trusted Platform Module (TPM) 2.0 in Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1. This update changes the TPM OS components and adds the ability to use BitLocker Drive Encryption with TPM 2.0.