How can i restore Security Backup File on Z667t???


How can i restore Security Backup File on Z667t??? Because i’m try to restore IMEI but always say me error (diferents erros). I root the phone with Kingroot 4.50 apk. I need original IMEI.
Why Sigma not put a restore security backup buttom??

——— 2016-03-04 10:46:27 ———
SigmaKey 2.15.05b2 ADB: Repair IMEI
* daemon not running. starting it now *
* daemon started successfully *
^ ZTE Handset 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
Baseband Processor: Qualcomm MSM8210
Restarting phone…Reconnect phone and try again