cant unlock n920t note 5

am trying to unlock n920t1
this phones use android application for official unlocking

here is log

Code:

INFO  : 13/02/2016 18:34:03 > To connect SM-N920T phone you have to perform the following steps:
INFO  : 13/02/2016 18:34:03 > 1. Disconnect USB cable from phone.
INFO  : 13/02/2016 18:34:03 > 2. Go to Menu->Settings->More->About Device.
INFO  : 13/02/2016 18:34:03 > 3.Tap on "Build number" 7 times to enable developer options.
INFO  : 13/02/2016 18:34:03 > 4. Go to Menu->Settings->More->Developer options.
INFO  : 13/02/2016 18:34:03 > 5. Turn on "USB Debugging" option.
INFO  : 13/02/2016 18:34:05 > -----------------------------------------------------------------------------------
INFO  : 13/02/2016 18:34:06 > Platform: Samsung Android
INFO  : 13/02/2016 18:34:06 > Selected port: COM1
INFO  : 13/02/2016 18:34:06 > Selected model: SM-N920T
INFO  : 13/02/2016 18:34:07 > ADB server killed.
INFO  : 13/02/2016 18:34:09 > Detected phone model: SM-N920T
INFO  : 13/02/2016 18:34:09 > Firmware compiled date: Fri Dec  4 17:27:12 KST 2015
INFO  : 13/02/2016 18:34:10 > PDA version: N920TUVS2COKC
INFO  : 13/02/2016 18:34:11 > CSC version: N920TTMB2COKC
INFO  : 13/02/2016 18:34:11 > SW version: N920TUVS2COKC
INFO  : 13/02/2016 18:34:13 > Phone SN: RF8G71ZGTPM
INFO  : 13/02/2016 18:34:13 > Android version: 5.1.1 (LMY47X)
INFO  : 13/02/2016 18:34:13 > Checking Root:
INFO  : 13/02/2016 18:34:19 > Phone is Rooted.
INFO  : 13/02/2016 18:34:19 > Reading security backup, please wait...
INFO  : 13/02/2016 18:34:52 > Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-N920T-Unknown13-02-2016_18-34-06-.asec file
INFO  : 13/02/2016 18:34:52 > Deactivating MSL...
INFO  : 13/02/2016 18:35:01 > Executing exploit...
ERROR : 13/02/2016 18:38:51 > Executing exploit failed
ERROR : 13/02/2016 18:38:51 > Phone unlocking failed


I attach logx file just in case it is needed

Attached Files
File Type: rar 13-02-2016_18-33-44.rar (2.5 KB)

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