Sony C4 – E5303 null imei .. any solution

hi i have sony c4 model:E5303 single sim

tried to repair imei
the operation done with sucsess but imei still the same then i do factory reset and pooo the imei is gone with Null Sign

tried to repair it again but here is the log :

Code:

SigmaKey 2.15.03 ADB: Repair IMEI
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.10.72+ ([email protected]) (gcc version 4.9 20140514 (mtk-20150408) (GCC) ) #1 SMP PREEMPT Sat Dec 12 17:58:24 CST 2015
Phone model: Sony E5303
Android 5.1; Firmware: 27.2.A.0.155; Date: Sat Dec 12 17:55:22 CST 2015
Version: 27.2.A.0.155
Baseband Processor: MT6752
Reading software IMEI.....Please send
C:\Users\ART\Documents\SigmaKey\temporary backup\Sony_E5303_27_2_A_0_155_Sat Dec 12 175522 CST 2015 (0).skb
file to [email protected]
Failed
--------- 2016-02-22 20:30:25 ---------
SigmaKey 2.15.03 ADB: Repair IMEI
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.10.72+ ([email protected]) (gcc version 4.9 20140514 (mtk-20150408) (GCC) ) #1 SMP PREEMPT Sat Dec 12 17:58:24 CST 2015
Phone model: Sony E5303
Android 5.1; Firmware: 27.2.A.0.155; Date: Sat Dec 12 17:55:22 CST 2015
Version: 27.2.A.0.155
Baseband Processor: MT6752
Reading software IMEI.....Please send
C:\Users\--\Documents\SigmaKey\temporary backup\Sony_E5303_27_2_A_0_155_Sat Dec 12 175522 CST 2015 (1).skb
file to [email protected]
Failed


any help plz ? should i uploade the SKB file or wat ?

thnx in advance