How to recover lost data after Bitlocker encrypted drive cannot unlock/repair?

I have a Bitlocker encrypted external HDD. I plugged it to pc with usb then i unlocked my drive on Win10 with my password as usual then i was copying the data from my unlocked Bitlocker encrypted drive to another non-encrypted drive. Then power cut suddenly. After that i cannot access my Bitlocker encrypted drive anymore. When I try to unlock that drive from Windows Explorer pop-up says "Bitlocker drive encryption on this drive is not compatible with your Windows. Try to unlock it with newer version of Windows." without password and recovery key input options. I also tried repair-bde without success.

There are several solutions to solve 'Cannot unlock/repair Bitlocker encrypted drive'.

Solution 1: Check connection

We suggest you remove Bitlocker encrypted drive from the computer, then re-attach the drive on a different port.

Solution 2: Update BIOS

Contact to the manufacturer and check for the latest updates available for the BIOS.

Solution 3: Try another Windows

If Bitlocker drive is encrypted on Windows 7/8, this Bitlocker encrypted drive cannot be read on Windows 10 as Windows 10 uses XTS-AES encryption algorithms and old Windows uses AES encryption algorithms, you need to try it on another Windows 7/8 computer.

If Bitlocker drive is encrypted on Windows 10 and chose 'New encryption mode', this Bitlocker encrypted drive cannot read on Windows 7/8 as new XTS-AES encryption algorithm is compatible with old Windows version, you need to try it on another Windows 10 computer.

Solution 4: Bitlocker data recovery

M3 Bitlocker Recovery is a professional Bitlocker data recovery software which can recover data from formatted, corrupted, inaccessible, failed Bitlocker encrypted drive, recover data after Bitlocker encryption/decryption stuck, interrupted, hung, failed, suspended, frozen as long as you have the password or 48-digit recovery key. M3 Bitlocker Recovery supports both AES and XTS-AES encryption algorithms.

Tutorial to recover data from Bitlocker encrypted drive with M3 Bitlocker Recovery

Step 1: Download, install and launch M3 Bitlocker Recovery on your computer.

Bitlocker data recovery software

Step 2: Select the inaccessible Bitlocker encrypted drive and then click Next to continue.

Step 3: Enter the password or 48-digit recovery key.

Scan the lost data from Bitlocker encrypted drive

Step 4: Scan the lost data from inaccessible Bitlocker encrypted drive.

Data recovery from stuck Bitlocker encrypted drive

Step 5: After your files are found, please select them and click "Recover" to save.

Recover data from Bitlocker encrypted drive

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