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en mi caso primero conecté el teléfono encendido previamente activando "Depuración USB" y "Desbloqueo OEM", espere a que se instalaran los drivers, luego apagué y en el software de Sigma seleccionar la plataforma MTK,, esperar a que se genere el puerto y dar click en "Direct unlock", dejo log. Saludos.
SigmaKey v.2.33.03
New version 2.33.05 is available on Debes estar registrado para ver el elemento.. We strongly recommend to update SigmaKey!
838977071 Sigma dongle 2.33, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Not activated
--------- 2019-08-17 19:38:34 ---------
SigmaKey 2.33.03 MTK: Direct unlock
MediaTek USB VCOM (Android) (COM61), Provider: MediaTek Inc., Driver ver.: 3.0.1504.0, Date: 21/01/2016, USB\VID_0E8D&PID_2007&REV_????
Baseband Processor...
SigmaKey v.2.33.03
New version 2.33.05 is available on Debes estar registrado para ver el elemento.. We strongly recommend to update SigmaKey!
838977071 Sigma dongle 2.33, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Not activated
--------- 2019-08-17 19:38:34 ---------
SigmaKey 2.33.03 MTK: Direct unlock
MediaTek USB VCOM (Android) (COM61), Provider: MediaTek Inc., Driver ver.: 3.0.1504.0, Date: 21/01/2016, USB\VID_0E8D&PID_2007&REV_????
Baseband Processor...
