Samsung s6 G920T1 unlock Problem

Welcome to Octoplus/Octopus Box Samsung software version 2.1.7
To connect SM-G920T1 phone you have to perform the following
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.
Platform: Samsung Android
Selected port: COM1
Selected model: SM-G920T1
Detected phone model: SM-G920T1
Firmware compiled date: Tue Oct 27 22:45:57 KST 2015
PDA version: G920T1UVU3DOJ6
CSC version: G920T1TMB3DOJ6
SW version: G920T1UVU3DOJ6
Phone SN: R58G50YPW5Z
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
Deactivating MSL…
Executing exploit…
Executing exploit failed
Read codes failed