Lenovo k5 trying to repair imei always fail


HI TEAM I HAVE LENOVO PHONE IMEI NULL I M TRYING TO REPAIR BUT ALWAYS FAIL HERE IS THE LOG
Code:

SigmaKey v.2.19.07
537070155 Sigma dongle 2.19, Initializing...OK
Pack 1: Activated
Pack 2: Activated
--------- 2016-10-29 13:40:27 ---------
SigmaKey 2.19.07 ADB: Repair IMEI
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.10.72+ (buildslave@xmws66) (gcc version 4.9 20140514 (mtk-20150408) (GCC) ) #1 SMP PREEMPT Sun Apr 17 15:20:42 CST 2016
Phone model: LENOVO Lenovo K52e78
Android 5.1; Firmware: LMY47I; Date: Sun Apr 17 15:19:54 CST 2016
Version: VIBEUI_V3.0_1615_5.518.1_ST_K52e78
Baseband Processor: MT6755M
Software IMEI: Not found
Reading security block....Not found