SED drive no longer recognized by DDPST after PBA removal

Hi,

Few months ago, I had to remove PBA from my laptop (Precision 5520) because I had locked my user/computer after several wrong password entries.

Since this operation, Dell Data Protection Security Tools no longer detects any sed drive.

Please, what can I do to retrieve the previous state of security (before PBA removal):
- PBA logon screen
- SED detected by my system
- no user locked
- no system locked

Nota: I tried to boot a gparted rom and I'm not able to see my sed, so I suppose that the drive is still encrypted.

Thanks a lot.