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Yes, data recovery is possible only if the BitLocker recovery key or another valid recovery method is available. A firmware update is a known trigger for BitLocker recovery.

What to do:

1. Find the recovery key
   • If the key was saved to Microsoft Entra ID, it can be viewed at https://myaccount.microsoft.com under Devices > select the device > View BitLocker Keys.
   • If the key was saved elsewhere, it might exist as a printed copy, on a USB device, or in directory services such as AD DS.
2. If the recovery screen is shown and the device still boots that far
   • Enter the 48-digit recovery password at the preboot BitLocker recovery screen.
   • After successful recovery from a firmware-related change, BitLocker updates the platform validation profile so recovery should not occur again on the next boot for the same change.
3. If Windows does not boot, unlock from Command Prompt in recovery
   • In Windows Recovery, select Troubleshoot > Advanced Options > Command Prompt.
   • Run:

          manage-bde -unlock -recoverypassword <password> C:
          manage-bde -protectors -disable C:
     

   • Replace C: with the correct drive letter and <password> with the BitLocker recovery key.
   • Reboot, then enter the recovery key again if prompted.
4. If the goal is to copy files off the drive
   • Boot from a Surface recovery image USB if applicable, open Command Prompt, then run:

          manage-bde -unlock -recoverypassword <password> C:
     

   • After the drive is unlocked, use copy or xcopy to move data to another drive.
5. If the recovery key cannot be found
   • BitLocker cannot be bypassed to recover the data.
   • Without the recovery key, the remaining option is to reset or reinstall Windows, which removes access to the encrypted data.

To prevent this in the future, suspend BitLocker before planned firmware or UEFI updates, then resume protection after the update completes.

Warning: disabling protectors or reinstalling Windows can affect protection or permanently remove access to encrypted data if done incorrectly.

• BitLocker recovery overview
• BitLocker recovery process
• Prompted for BitLocker recovery key after installing updates to Surface UEFI or TPM firmware on Surface device