How to Fix BitLocker Device Encryption cannot be used, 0x8031004A Error?

The error code 0x8031004A when backing up files indicates that there’s something wrong with your device, you can change another drive for file backup, or you can fix this issue by following methods.

The Reason for BitLocker 0x8031004A Code Error

1. System File Failure: If you are using BitLocker to encrypt your system disk and experience an abnormal interruption during encryption/decryption, it may result in damage to critical system files, causing an exception.

2. Disk Errors: For example, Disk space corruption can lead to conflicts.

3. Lack of System Memory: Excessive system junk and insufficient Backup Space can also result in this error.

Solution 1: Perform a Clean Boot

Step 1 Press [Win + R], typing "msconfig", and then press Enter.

Step 2 Click on Services tab，check "Hide all Microsoft service", and then click on "Disable all" button.

Step 3 Then in the "Startup" tab, click on "Open Task Manager".

Step 4 On the Startup tab in Task Manager, Right-click on each enabled startup item, and then choose "Disable".

Step 5 Return back to "System Configuration" window, click on "Apply" > "OK".

Step 6 Restart your computer, it will be in a clean boot environment. Then perform the backup operation again.

Solution 2: Repair System Files

Step 1 Type "cmd" in the search box, and then press [Ctrl + Shift + Enter] to run Command Prompt as Administrator.

Step 2 Run the following command:

Step 3 After complete, run the command below:

Step 4 Restart your computer to confirm if the issue fixed.

Solution 3: Disable WinRE before Finish Backup Process

Step 1 Type "cmd" in the search box, and choose to Run as administrator.

Step 2 Run following command:

Step 3 Retry the file backup operation, and then use the following command to re-enable the WinRE:

Solution 4: Use Windows Startup Repair to Repair Corrupted Files

Step 1 Click the power icon in the "Start" menu, and press and hold the Shift key while clicking or selecting "Restart" to enter into WinRE environment.

Step 2 Entering into Troubleshoot -> Advanced options -> Startup Repair

Step 3 Wait for the repair process to complete, then restart the computer.

Solution 5: Perform Disk Cleanup

Step 1 Right-click the system drive, then click "Properties".

Step 2 Click on the "Disk cleanup". Select the files to be cleaned, click "Clean up system files", and then click "OK" when finished.

Solution 6: Check and Repair Disk Errors

Step 1 Run Command Prompt as an Administrator. Then Run the following disk check command:

Step 2 If there are issues being detected after the disk check, the system will automatically repair it.