fail to unlock sm-g920t (5.1.1)

Welcome to Octoplus/Octopus Box Samsung software version 2.1.9
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To connect SM-G920T 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: COM1
Selected model: SM-G920T
Searching for a phone. Please wait…
ADB server killed.
Please, press "OK" button on the phone to allow USB debugging..
Phone found.
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone IMEI: Unknown
Phone SN: R58G40ALY7R
Android version: 5.1.1 (LMY47X)
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G920T
Detected phone model: SM-G920T
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone SN: R58G40ALY7R
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\BACKUP\Security-SM-G920T-Unknown03-02-2016_09-36-50-.asec file
Deactivating MSL…
Executing exploit…
Executing exploit failed
Reading Certificate failed
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G920T
Detected phone model: SM-G920T
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone SN: R58G40ALY7R
Android version: 5.1.1 (LMY47X)
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-G920T-Unknown03-02-2016_09-41-17-.asec file
Unlocking phone…
Deactivating MSL…
Executing exploit…
Executing exploit failed
Phone unlocking failed
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Platform: Samsung Android
Selected port: COM1
Selected model: SM-G920T
Detected phone model: SM-G920T
Firmware compiled date: Mon Nov 30 10:58:17 KST 2015
PDA version: G920TUVS3DOJC
CSC version: G920TTMB3DOJC
SW version: G920TUVS3DOJC
Phone SN: R58G40ALY7R
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\BACKUP\Security-SM-G920T-Unknown03-02-2016_09-46-13-.asec file
Deactivating MSL…
Executing exploit…
Executing exploit failed
Read codes failed