Update the BIOS for BitLocker Drive Encryption

When you attempt to turn on BitLocker for the first time on the drive that Windows is installed on, you might receive an error message stating that your basic input/output system (BIOS) must be updated before you can use BitLocker. This is because the computer was manufactured with the Trusted Platform Module (TPM) security hardware (a special microchip in some newer computers that supports advanced security features), version 1.2 or higher, and your computer's BIOS needs an update to work properly with TPM.

Procedures for updating the BIOS vary depending on the manufacturer. Check the information that came with your computer or go to the computer manufacturer's website. For more information about BIOS, see BIOS: frequently asked questions.

If you've already turned on BitLocker and need to update the BIOS for another reason, such as solving a hardware compatibility problem, temporarily suspend BitLocker before updating the BIOS, and then resume BitLocker when the update is complete. This prevents BitLocker from locking the drive Windows is installed on when you restart the computer after the update.

Updating the BIOS is an advanced procedure, and if an error occurs, your computer could stop working. Be sure to follow the manufacturer's instructions exactly.

Assistive technology software that runs on Windows, such as screen reading software, cannot read BitLocker startup screens because they are displayed during BIOS startup and before Windows runs. This includes screens used when you type a PIN or recovery key, and any BitLocker error messages.

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