ZTE Z730: How to restore a .skb backup?

Hi, just tried to unlock this phone with sigma, but unlock process failed (see log).

How can I restore the saved .skb backup?. Now phone's IMEI is corrupted.

Thanks in advance.

Code:

SigmaKey 2.13.03 ADB: Get unlock codes
* daemon not running. starting it now *
* daemon started successfully *
^ ZTE Handset ADB Interface
Version: Linux version 3.4.0+ (xueyibing@zte2) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Fri Mar 28 14:59:01 CST 2014
Phone model: zte Z730
Android 4.3; Firmware: JLS36C; Date: Fri Mar 28 14:46:54 CST 2014
Version: Z730_MetroPCSV1.0.0B06
Baseband Processor: Qualcomm MSM 8610 (Flattened Device Tree)
Unable to read codes for this phone model. Do you want to perform direct unlock instead? [YES]
Date: Mar 28 2014 08:56:51, Mar 19 2014 14:00:00, BAAAANAZ
IMEI: 863993023647904
Security area saved to "C:\Users\jepetu\Documents\SigmaKey\security backup\863993023647904_zte_Z730_JLS36C.skb"
Writing data....Error 00000000:DEAD

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ZTE Z730: How to restore a .skb backup?