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yo pude liberarla con sigma, apagada conectamos, seleccionamos el modulo mtk en sigma y direct unlock y listo
--------- 2019-04-10 11:42:52 ---------
SigmaKey 2.30.02b1 MTK: Get unlock codes
MediaTek USB VCOM (Android) (COM95), Provider: MediaTek Inc., Driver ver.: 3.2.0.0, Date: 21/01/2016, USB\VID_0E8D&PID_2007&REV_????
Baseband Processor: MT6735, E00
Version: FAJUE8735_TB_M_HW
Firmware: MOLY.LR9.W1444.MD.LWTG.MP.V79.P6.35.D1.001.2358.245.247_LOCK
IMEI: 354399080********
Phone model: AFFIX_T737_v1.6_01102017
If phone remains locked, please try Yoda method (via ADB mode).
Reading unlock codes...Done
Restarting phone...Done
--------- 2019-04-10 11:42:52 ---------
SigmaKey 2.30.02b1 MTK: Get unlock codes
MediaTek USB VCOM (Android) (COM95), Provider: MediaTek Inc., Driver ver.: 3.2.0.0, Date: 21/01/2016, USB\VID_0E8D&PID_2007&REV_????
Baseband Processor: MT6735, E00
Version: FAJUE8735_TB_M_HW
Firmware: MOLY.LR9.W1444.MD.LWTG.MP.V79.P6.35.D1.001.2358.245.247_LOCK
IMEI: 354399080********
Phone model: AFFIX_T737_v1.6_01102017
If phone remains locked, please try Yoda method (via ADB mode).
Reading unlock codes...Done
Restarting phone...Done