G930T failed to unlock

Operation: Unlock
Selected model: SM-G930T
Selected port: COM71 SAMSUNG Mobile USB Serial Port
Software version: 33.7

Checking Login and Password... OK
Ballance: 18 crd.
You have 18 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G930T
Android version: 8.0.0
PDA version: G930TUVU4CRF1
CSC version: G930TTMB4CRF1
Phone version: G930TUVU4CRF1
Product code: Not Active
CSC country code: USA
CSC sales code: TMB
Phone SN: R58H20YFLBJ
IMEI: 35591607016****
HW version: MSM8996.00
RF cal date: NONE
Chip name: MSM8996
Modem board: MSM8996
Security patch: 2018-04-01
Boot Warranty bit: 0
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... OK
Rebooting to upload... OK
Searching Ramdump interface... COM11 detected
Reading data from phone... OK
Calculating... error (4)

Done with Samsung Tool PRO v.33.7