Windows 7 Pre-Provision Bitlocker Not Working

After updating Configuration Manager 2012 R2 and adding the Windows 10 ADK, task sequences will no longer pre-provision BitLocker

Reason:

With WinPE 10 it uses the AES-CBC 128-bit encryption method.

Solution:

Add the following Run Command Line steps after Format and Partition and before Pre-provision BitLocker.

  1.  Set EncryptionMethodWithXtsFdv – reg add HKLM\SOFTWARE\Policies\Microsoft\FVE /t REG_DWORD /v EncryptionMethodWithXtsFdv /d 3 /f
  2. Set EncryptionMethodWithXtsOs – reg add HKLM\SOFTWARE\Policies\Microsoft\FVE /t REG_DWORD /v EncryptionMethodWithXtsOs /d 3 /f
  3. Set EncryptionMethodWithXtsRdv – reg add HKLM\SOFTWARE\Policies\Microsoft\FVE /t REG_DWORD /v EncryptionMethodWithXtsRdv /d 3 /f

Available Encryption Methods in WinPE 10

  1. Value Data: 3 (Description: AES-CBC 128-bit)
  2. Value Data: 4 (Description: AES-CBC 256-bit)
  3. Value Data: 6 (Description: XTS-AES 128 bit)
  4. Value Data: 7 (Description: XTS-AES 256-bit)
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