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no necesitas rootearlo ni el adb activado, solo te debe reconocer el puerto DBAdapter Reserved Interface (COMXX) para ello tener los drivers instalados correctamente y te vas a la pestaña de qualcomm y lo hace directo y rapido...
SigmaKey 2.15.02 Qcom: Repair IMEI
DBAdapter Reserved Interface (COM73), Provider: Huawei Incorporated, Driver ver.: 2.0.6.714, Date: 07/04/2015, USB\VID_12D1&PID_2553&REV_0228&MI_01
Version: Y625-U13V100R001C480B103
Firmware: 8x10_PL190335_20141120
Date: Aug 28 2015 17:04:21, Mar 04 2015 22:00:00, BAAAANWZ
IMEI: 8663400XXXXXXXX
Bluetooth address: 000000000000
Repaired IMEI:86XXXXXXXXXXXX
Done
Restarting phone...Done
SigmaKey 2.15.02 Qcom: Repair IMEI
DBAdapter Reserved Interface (COM73), Provider: Huawei Incorporated, Driver ver.: 2.0.6.714, Date: 07/04/2015, USB\VID_12D1&PID_2553&REV_0228&MI_01
Version: Y625-U13V100R001C480B103
Firmware: 8x10_PL190335_20141120
Date: Aug 28 2015 17:04:21, Mar 04 2015 22:00:00, BAAAANWZ
IMEI: 8663400XXXXXXXX
Bluetooth address: 000000000000
Repaired IMEI:86XXXXXXXXXXXX
Done
Restarting phone...Done