Cant unlock g930t via tmb server

Operation: Unlock
Selected model: SM-G930T
Selected port: COM3 Z3X BOX Serial Port
Software version: 31.0

Checking Login and Password... OK
Ballance: 25 crd.
You have 25 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G930T
Android version: 7.0
Product code: SM-G930TZDATMB
Phone version: G930TUVS4BRA1
PDA version: G930TUVS4BRA1
CSC version: G930TTMB4BRA1
CSC country code: USA
CSC sales code: TMB
HW version: REV0.6
Phone SN: R58H32FN4FK
Chip name: MSM8996
Modem board: MSM8996
Security patch: 2018-01-01
RF cal date: 2016.03.14
IMEI: 3559160XXXXXXX
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... COM75 detected
Reading data from phone... error (0.1)

Done with Samsung Tool PRO v.31.0