n910t 5.1.1 unlocking error

Hi octopus team can we unlock this note 4 locked from t-mobile?

I also tried 2.1.6 version but still same result

Platform: Samsung Android
Selected port: COM156
Selected model: SM-N910T
Reading info…
Mode: Normal
Firmware compiled date: Sep 25 2015
Firmware compiled time: 11:00:00
Firmware released date: Nov 9 2015
Firmware released time: 15:39:49
SW Version: MPSS.DI.3.0.c5-00436-M9625TAARANSZM-1
Please, press "OK" button on the phone to allow USB debugging..
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-N910T
Firmware compiled date: Mon Nov 9 22:04:39 KST 2015
PDA version: N910TUVU2DOK2
CSC version: N910TTMB2DOK2
SW version: N910TUVU2DOK2
Phone IMEI: Unknown
Phone SN: RF8FC0660CN
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Backup saved as Security-SM-N910T-02-01-2016_17-21-47 file
Unlocking phone…
Phone will restart now. Please don’t disconnect cable!
Phone unlocking failed