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KB5025885: How to manage the Windows Boot Manager revocations for ...
Secure Boot is recommended by Microsoft to make a safe and trusted path from the Unified Extensible Firmware Interface (UEFI) through the Windows kernel Trusted Boot sequence. Secure Boot helps prevent bootkit malware in the boot sequence. Disabling Secure Boot puts a device at risk of being infected by bootkit malware.
"Boot failed" error when you start a UEFI-enabled computer from a 64 ...
Download this hotfix, and then run the following command to extract the Windows6.1-KB982929-x64.msu file into the temporary folder: 417821_intl_x64_zip.exe –x. Use the following commands to view each store-keeping unit (SKU) or index in the .wim file: Dism /Get-WimInfo /WimFile:<pathto>boot.wim.
“An operating system wasn’t found” error when booting Windows
Windows 10. Symptoms. When trying to boot Windows, you receive the error: An operating system wasn’t found. Try disconnecting any drives that don’t contain an operating system. Press Ctrl+Alt+Del to restart. Resolution. A bootable USB or DVD with Windows 7 or higher is needed to bring up the Command Prompt.
KB4535680: Security update for Secure Boot DBX: January 12, 2021
An attacker who successfully exploited the vulnerability might bypass secure boot and load untrusted software. This security update addresses the vulnerability by adding the signatures of the known vulnerable UEFI modules to the DBX. To learn more about this security vulnerability, see CVE-2020-0689 | Microsoft Secure Boot Security Feature ...
How to perform a clean boot in Windows - Microsoft Support
How to perform a clean boot. These steps might look complicated at first glance, but following them in order, step-by-step, will help you get you back on track. Windows 11 Windows 10 Windows 8.1. Sign in to the computer as an administrator.
Create installation media for Windows - Microsoft Support
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.
How to use Surface UEFI - Microsoft Support
Surface. Windows 11 Windows 10. Surface Unified Extensible Firmware Interface (UEFI) replaces the standard basic input/output system (BIOS) with new features including faster startup and improved security. You can use Surface UEFI to manage the firmware features on your Surface. These Surface models use the new firmware UEFI interface:
Enable TPM 2.0 on your PC - Microsoft Support
How to enable TPM. If you need to enable TPM, these settings are managed via the UEFI BIOS (PC firmware) and vary based on your device. You can access these settings by choosing: Settings > Update & Security > Recovery > Restart now. From the next screen, choose Troubleshoot > Advanced options > UEFI Firmware Settings > Restart to make the changes.
Windows 11 and Secure Boot - Microsoft Support
From the next screen, select Troubleshoot > Advanced options > UEFI Firmware Settings > Restart to make changes. To change these settings, you will need to switch the PC boot mode from one enabled as “Legacy” BIOS (also known as “CSM” Mode) to UEFI/BIOS (Unified Extensible Firmware Interface).
A UEFI-enabled computer may "hang" at a black screen in the startup ...
Cause. This issue occurs because the one of the following applications does not clean up all the page table entries for the pages that were freed: The Windows Operating System Loader (Winload.efi) application. The Windows Resume Loader (Winresume.efi) application.