Help zte max z970

hello! team
i unlock zte max z970 with sigma box of which i had successfully done. but when i insert a sim card, it is still asking for network unlock pin.




SigmaKey v.2.28.00
654066507 Sigma dongle 2.28, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2018-06-26 15:39:24 ---------
SigmaKey 2.28.00 ADB: Direct unlock
* daemon not running. starting it now *
* daemon started successfully *
^ ROMaster Composite ADB Interface
Version: Linux version 3.4.0-ga0dde4d-00078-g83c8bdc (xueyibing@scm12) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Fri Nov 4 11:26:52 CST 2016
Phone model: zte Z970
Android 4.4.4; Firmware: KTU84P; Date: Fri Nov 4 11:01:23 CST 2016
Version: Z970_MetroPCSV1.0.0B15
Baseband Firmware: .3.0.c9.6-00021-M8926DAAAANAZM-1
Baseband Processor: Qualcomm MSM8926
Date: Aug 19 2015 10:24:17, Aug 14 2015 04:00:00, DAAAANAZ
Software IMEI: 865*************
Security area saved to "C:\Users\ND\Documents\SigmaKey\security backup\0654066507\865891026680807_zte_Z970_KTU84P (0).skb"
Unlocking phone.....Done
Restarting phone...Done