How to change Bitlocker password in Windows 10/8/7?
Solution 1: Change Bitlocker password with control panel
Step 1: Open the Control Panel and click/tap on the BitLocker Drive Encryption icon.
Step 2: Under the Bitlocker encrypted drive you want to change the password for, click/tap on the Change password link.
Step 3: Type in the Old password, type in a New password, type the new password again to Confirm new password, and click/tap on Change password.
Step 4: If the password has been successfully changed, click/tap on Close.
Solution 2: Change Bitlocker password with command line
Step 1: Open command prompt with Adminstrator.
Step 2: Type the command: "manage-bde -changepassword X:" (Replace X with the drive letter of your Bitlocker encrypted drive), and press Enter.
Step 3: Type the new password when prompted, and press Enter.
Step 4: Confirm the new password by typing it again when prompted, and press Enter.
Step 5: If your password has been successfully updated, you can now close the elevated command prompt.