Problems to repair Imei zte zmax z970 !!

I have problems to repair imei on this phone, i try to repair in adb and fail, in ftm mode fail too, i make root and try again and the same, check the log:

SigmaKey v.2.14.01
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610640106 Sigma dongle 2.14, Initializing...OK
Pack 1: Activated
Pack 2: Activated
--------- 2015-12-17 19:33:01 ---------
SigmaKey 2.14.01 ADB: Restablecimiento de IMEI
* daemon not running. starting it now *
* daemon started successfully *
^ ROMaster Composite ADB Interface
Versión: Linux version 3.4.0-g1af7f82 (xueyibing@scm12) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Tue Aug 18 23:35:33 CST 2015
Modelo del teléfono: zte Z970
Android 4.4.4; Firmware: KTU84P; Fecha: Tue Aug 18 23:17:24 CST 2015
Versión: Z970_MetroPCSV1.0.0B13
Flasheo de banda de base: .3.0.c9.6-00021-M8926DAAAANAZM-1
Procesador Baseband: Qualcomm MSM8926
Fecha: Aug 19 2015 10:24:17, Aug 14 2015 04:00:00, DAAAANAZ
IMEI: 354721098606646
Leyendo datos....Error de escritura por el puerto

Thanks in advance !!

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Problems to repair Imei zte zmax z970 !!