You need to be root to run this program.
0.a sudo -s

If the libata.allow_tpm flag was not set at boot time you need to change it,
optional steps 0.b & 0.c will do this:

0.b chmod 0744 /sys/module/libata/parameters/allow_tpm
0.b echo "1" > /sys/module/libata/parameters/allow_tpm

1. sedutil-cli --scan    <- SCAN to find Opal Drive (you should see Yes next the the drive
                     your working with.
2. sedutil-cli --query /dev/sd? <--this will show the Opal status look at the locking
                                               feature and see if it is Locked = Y
                                               or LockingEnabled = Y that's a good
                                                sign that this should work
3.sedutil-cli --yesIreallywanttoERASEALLmydatausingthePSID <PSIDALLCAPSNODASHES> /dev/sd?

4.  You should see INFO: revertTper completed successfully.
    If you get a message that says NOT_AUTHORIZED you entered the PSID wrong.

If it doesn't work please execute the command in step 3 with a -vvvvv (5 v's) as the first option
redirecting the output to a file and send it back to me.
example:
sedutil-cli -vvvvv --yesIreallywanttoERASEALLmydatausingthePSID <PSIDALLCAPSNODASHES> /dev/sd? > revertlog.txt

Hope this helps.
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The following is a sanitized log of the commands and expected responses.

r0m30@r0m30-PC:~$ sudo -s
root@r0m30-PC:~# chmod 0744 /sys/module/libata/parameters/allow_tpm
root@r0m30-PC:~# echo "1" > /sys/module/libata/parameters/allow_tpm
root@r0m30-PC:~# ./sedutil-cli --scan

Scanning for Opal 2.0 compliant disks
/dev/sd0  No  ATA     KINGSTON SV100S21205 
/dev/sd1  No  ATA     Hitachi HDT72504V5CO 
/dev/sd2  No  ATA     KINGSTON SV100S21205 
/dev/sd3  No  ATA     WDC WD5000AAKS-012.0 
/dev/sd4  No  Generic-Compact Flash   1.00 
/dev/sd5  No  Generic-SM/xD-Picture   1.00 
/dev/sd6  No  Generic-SD/MMC          1.00 
/dev/sd7  No  Generic-MS/MS-Pro       1.00 
/dev/sd8  Yes ATA     Crucial_CT120M50MU05 
No more disks present ending scan
root@r0m30-PC:~# ./sedutil-cli --query /dev/sd8
/dev/sd8 ATA ATA     Crucial_CT120M50MU05 

TPer function (0x0001)
    ACKNAK = N, ASYNC = N. BufferManagement = N, comIDManagement  = N, Streaming = Y, SYNC = Y
Locking function (0x0002)
    Locked = N, LockingEnabled = Y, LockingSupported = Y, MBRDone = N, MBREnabled = N, MediaEncrypt = Y
Geometry function (0x0003)
    Align = Y, Alignment Granularity = 8 (4096), Logical Block size = 512, Lowest Aligned LBA = 0
SingleUser function (0x0201)
    ALL = N, ANY = N, Policy = Y, Locking Objects = 9
DataStore function (0x0202)
    Max Tables = 9, Max Size Tables = 94371840, Table size alignment = 1
OPAL 2.0 function (0x0203)
    Base comID = 0x1000, Initial PIN = 0x0, Reverted PIN = 0x0, comIDs = 1
    Locking Admins = 4, Locking Users = 9, Range Crossing = N
root@r0m30-PC:~# ./sedutil-cli --yesIreallywanttoERASE*ALL*mydatausingthePSID <PSIDALLCAPSNODASHES> /dev/sd8
- 01:14:10.996 INFO: Performing a PSID Revert on /dev/sd8 with password <PSIDALLCAPSNODASHES>
- 01:14:11.165 INFO: revertTper completed successfully
root@r0m30-PC:~#