SM-G935T unlock problem [Answered]

Welcome to Octoplus Box Samsung software version 2.6.6
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To connect SM-G935T phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
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Platform: Samsung Android
Selected port: COM203
Selected model: SM-G935T
Operation: Unlock
Detected phone model: SM-G935T
Firmware compiled date: Mon Oct 30 15:32:16 KST 2017
PDA version: G935TUVS4BQJ2
CSC version: G935TTMB4BQJ2
SW version: G935TUVS4BQJ2
Phone SN: RF8H709LA5V
Android version: 7.0 (NRD90M)
Sales code: TMB
Country: USA
HW platform: msm8996
HW Chip: MSM8996
HW Modem: MSM8996
Security patch level: 2017-11-01
SIM 1 status: network locked
Codename: hero2qltetmo
Connecting to server...
Connecting to server...Ok!
Checking resource files...
Resource files already downloaded.
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Connecting to server...OK
Checking smart card...OK
Username: *********
Authorizing...OK
Checking balance...OK
Checking operation...OK
Your balance: 100 credits.
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Sending device information...OK
Rebooting phone in Download Mode...
Searching for a phone. Please wait...
Phone found.
Firmware write started.
Writing Data section...
Data section has been written successfully.
Searching for a phone. Please wait...OK
Reading security backup, please wait...
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G935T-RF8H709LA5V-10-03-2018_10-11-
19.asec file
Rebooting phone in Download Mode...
Searching for a phone. Please wait...
Phone found.
Firmware write started.
Writing Data section...
Data section has been written successfully.
Searching for a phone. Please wait...OK
Initializing..OK
Unlocking phone...OK
Phone will restart now. Please don't disconnect cable!
Searching for a phone. Please wait...OK
Initializing..OK
Finalizing...
Phone unlocking failed
Performed by 2.6.6 Software version.