Windows Bootloop with BitLocker PIN in BIOS CMS

Windows Not Booting (Bootloop) - Accepting BitLocker PIN in BIOS CMS?

Abstract: Learn how to accept BitLocker PIN in BIOS CMS during Windows bootloop.

Created: 2024-04-22 by UserComp.com Editors

Windows Not Booting (Boot Loop) - Accepting BitLocker PIN in BIOS CMS Mode

Modern Windows installations use the Unified Extensible Firmware Interface (UEFI) and Secure Boot to enhance security and prevent unauthorized access. However, there might be instances where you need to boot in CMS (Compatibility Support Module) mode with BIOS enabled. This article will discuss the steps to take when Windows does not boot and is stuck in a boot loop, particularly when you need to accept a BitLocker PIN in BIOS CMS mode.

Understanding BitLocker and CMS Mode

BitLocker is a full disk encryption feature included with Windows. It is designed to protect data by providing encryption for entire volumes. CMS mode, also known as Legacy BIOS mode, is an older firmware interface that preceded UEFI. To access a BitLocker-encrypted drive in CMS mode, you must enter the BitLocker recovery key or PIN.

Why Windows Might Not Boot in UEFI Mode

Windows might not boot in UEFI mode due to various reasons, such as corrupted system files, incorrect BIOS settings, or issues with the boot loader. In such cases, you might need to boot in CMS mode with BIOS enabled, particularly if you need to access a BitLocker-encrypted drive.

Steps to Accept BitLocker PIN in BIOS CMS Mode

Restart your computer and press the key to enter the BIOS setup (usually F2, F10, or DEL).
Change the boot order to boot from the Legacy/CMS boot device.
Save the changes and exit the BIOS setup.
The system should now boot in CMS mode. You will be prompted to enter the BitLocker recovery key or PIN.
Enter the BitLocker recovery key or PIN to unlock the drive and continue booting Windows.

Additional Steps to Troubleshoot Boot Issues

If Windows still does not boot after accepting the BitLocker PIN in CMS mode, consider the following steps:

Check the system files for corruption using the System File Checker (SFC) tool.
Repair the boot loader using the Bootrec.exe tool.
Perform a clean installation of Windows.

References

Tags: Windows BitLocker Bootloop BIOS

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