Zte z667T cannot unlock SigmaKey v.2.12.07

Zte z667T cannot unlock

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SigmaKey v.2.12.07
412745454 Sigma dongle 2.12, Initializing...OK
Pack 1: Activated
Pack 2: Activated
--------- 2015-09-28 13:25:32 ---------
SigmaKey 2.12.07 ADB: Obtain root privileges (Method #9)
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.4.0-g71ceab6-00270-gb3321ac (heduolian@ztesuper21) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Fri Sep 12 12:36:20 CST 2014
Phone model: zte Z667T
Android 4.4.2; Firmware: KVT49L; Date: 2014年 09月 12日 星期五 12:23:39 CST
Version: Z667TV1.0.0B08
Android Version: 4.4.2 "KitKat"
Obtaining root privileges.........Failed
--------- 2015-09-28 13:32:01 ---------
SigmaKey 2.12.07 ADB: Obtain root privileges (Method #10)
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.4.0-g71ceab6-00270-gb3321ac (heduolian@ztesuper21) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Fri Sep 12 12:36:20 CST 2014
Phone model: zte Z667T
Android 4.4.2; Firmware: KVT49L; Date: 2014年 09月 12日 星期五 12:23:39 CST
Version: Z667TV1.0.0B08
Android Version: 4.4.2 "KitKat"
Obtaining root privileges....Failed

Pack 1 and 2 activeted