ZTE Z970 Unlock Faild

I bought the Sigmabox just for the zte Z970 unlock and it seems that I just waist my money for nothing……

Every time it keep saying Preparing….Reconnect phone and try again
I tried 3 computers and 5 phones and 4 USB cables and it keeps saying the same thing.

SigmaKey v.2.15.02
257239608 Sigma dongle 2.15, Initializing…OK
Pack 1: Activated
Pack 2: Activated
——— 2016-02-09 15:51:52 ———
SigmaKey 2.15.02 ADB: Get unlock codes
* daemon not running. starting it now *
* daemon started successfully *
^ ZTE Composite ADB Interface
Version: Linux version 3.4.0-g9b6969a-00469-g20d00e4 (xueyibing@zte2) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Mon Dec 22 15:19:55 CST 2014
Phone model: zte Z970
Android 4.4.2; Firmware: KVT49L; Date: Mon Dec 22 15:10:09 CST 2014
Version: Z970V1.0.0B22
Baseband Firmware: 0.1.c1.18-00005-M8926DAAAANAZM-1
Unable to read codes for this phone model. Do you want to perform direct unlock instead? [YES]
Obtaining root privileges…NO
Preparing….Reconnect phone and try again