Unable to unlock bitlocker via WinPE

oscarh325 21 Reputation points

Currently have a functional WinPE USB drive by following the guide here:
and here:

I used the ADK option of
**Download the ADK for Windows 10, version 2004:

Windows ADK for Windows 10, version 2004  
Windows PE add-on for the ADK, version 2004  

This ADK supports Windows 10, version 2004, and later versions of Windows 10**   

`as the target machine is running 20H2

i want to add the functionality of unlocking bitlocker in winpe, on a windows 10 machine, so i can recover some files from it.
i followed this guide:

and this guide:

seems the key OC's are
File management/WinPE-FMAPI and Startup/WinPE-SecureStartup

using the commands from the lazyexhange link, all but the last OC will install, the last one being the secure startup one, needed for BDE functionality

Dism /Image:"C:\WinPE_amd64\mount" /add-package /packagepath:"C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Windows Preinstallation Environment\amd64\WinPE_OCs\en-us**WinPE-SecureStartup_en-us.cab**"

This will return an error of

Error: 0x800f081e
The specified package is not applicable to this image.

I have tried the non-language specific version using

Dism /Image:"C:\WinPE_amd64\mount" /add-package /packagepath:"C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Windows Preinstallation Environment\amd64\WinPE_OCs**WinPE-SecureStartup.cab**"

as well but get the same error

and if i try to run manage-bde in winpe anyway, i will get the error that it is not a supported command

here is the dism log

Thanks in advance

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
2,594 questions
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