From SMU you can try option "Repurposing disks",
https://support.hpe.com/hpesc/public/docDisplay?docId=c04220794 (page no 76)
Repurposing a disk changes the encryption key on the disk and effectively deletes all data on the disk.
Repurpose a disk only if you no longer need the data on the disk.
To repurpose a disk
1. In the System topic, select Action > Full Disk Encryption.
The Full Disk Encryption panel opens with the FDE General Configuration tab selected.
2. Select Repurpose Disks tab.
3. Select the disk to repurpose.
4. Click Repurpose. A dialog box displays.
5. Perform one of the following:
To repurpose the selected disk, click Yes.
To cancel the request, click No.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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