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Es muy fácil pero no encontré nada, el aporte es simplemente para recordar viejos métodos y que no se quebren tanto la cabeza como yo, lo único que hay que hacer es flashear eng boot pc1 del j120a. Root con kingo Root y new unlock con z3x. Un apunte nada más, yo flashee el eng modem del binario 5 antes de este proceso intentando liberar por diag, pero no creo que sea necesario. Aqui el log:
Waiting ADB device... Listo
[ 3/21/2018 11:32:00 AM ] Leyendo información del teléfono ...
[ 3/21/2018 11:32:00 AM ] Modelo: SAMSUNG-SM-J120AZ
[ 3/21/2018 11:32:00 AM ] Android version: 6.0.1
[ 3/21/2018 11:32:00 AM ] Código del Producto: SM2J120AZKZAIO
[ 3/21/2018 11:32:00 AM ] Versión del telefono: J120AZTUS5ARA1
[ 3/21/2018 11:32:00 AM ] PDA version: J120AZTUS5ARA1
[ 3/21/2018 11:32:00 AM ] CSC version: J120AZAIO5ARA1
[ 3/21/2018 11:32:00 AM ] Código de país CSC: USA
[ 3/21/2018 11:32:00 AM ] Código de Venta CSC: AIO
[ 3/21/2018 11:32:00 AM ] HW version: REV0.3
[ 3/21/2018 11:32:00 AM ] Phone SN: R58J401DQ1A
[ 3/21/2018 11:32:00 AM ] Chip name: EXYNOS3475
[ 3/21/2018 11:32:00 AM ] Módem: SHANNON308
[ 3/21/2018 11:32:00 AM ] Security patch: 2018-01-01
[ 3/21/2018 11:32:00 AM ] RF cal date: 20170401
[ 3/21/2018 11:32:00 AM ] IMEI: 356903083826771
[ 3/21/2018 11:32:00 AM ] Verificando derecho de Super Usuario... verdadero
[ 3/21/2018 11:33:00 AM ] Reading NV data... Listo
[ 3/21/2018 11:33:00 AM ] Checking NV data... Listo
[ 3/21/2018 11:33:00 AM ] Reading data... Listo
[ 3/21/2018 11:33:00 AM ] Detecting MODEM... Listo
[ 3/21/2018 11:33:00 AM ] Reading MODEM... Listo
[ 3/21/2018 11:33:00 AM ] Calculando... Listo
[ 3/21/2018 11:33:00 AM ] Initialization data... Listo
[ 3/21/2018 11:33:00 AM ] Writing zTool... Listo
[ 3/21/2018 11:33:00 AM ] Initialization zTool... Listo
[ 3/21/2018 11:33:00 AM ] Running zTool, please wait...
[ 3/21/2018 11:33:00 AM ] Start... Listo
[ 3/21/2018 11:33:00 AM ] Initialization... Listo
[ 3/21/2018 11:33:00 AM ] Generate and check client proof... Listo
[ 3/21/2018 11:33:00 AM ] Verify proof by client... Listo
[ 3/21/2018 11:33:00 AM ] Reading data... Listo
[ 3/21/2018 11:34:00 AM ] HWID: 67 CF 2F CA 91 E6 4F BD 69 3C 30 E1 E5 82 F1 4C
[ 3/21/2018 11:34:00 AM ] Calculando... Listo
[ 3/21/2018 11:34:00 AM ] Desbloquear... Listo
[ 3/21/2018 11:34:00 AM ] Writing NV data... Listo
[ 3/21/2018 11:34:00 AM ] Reiniciando teléfono ... Listo
[ 3/21/2018 11:34:00 AM ] Desbloqueo Listo
Waiting ADB device... Listo
[ 3/21/2018 11:32:00 AM ] Leyendo información del teléfono ...
[ 3/21/2018 11:32:00 AM ] Modelo: SAMSUNG-SM-J120AZ
[ 3/21/2018 11:32:00 AM ] Android version: 6.0.1
[ 3/21/2018 11:32:00 AM ] Código del Producto: SM2J120AZKZAIO
[ 3/21/2018 11:32:00 AM ] Versión del telefono: J120AZTUS5ARA1
[ 3/21/2018 11:32:00 AM ] PDA version: J120AZTUS5ARA1
[ 3/21/2018 11:32:00 AM ] CSC version: J120AZAIO5ARA1
[ 3/21/2018 11:32:00 AM ] Código de país CSC: USA
[ 3/21/2018 11:32:00 AM ] Código de Venta CSC: AIO
[ 3/21/2018 11:32:00 AM ] HW version: REV0.3
[ 3/21/2018 11:32:00 AM ] Phone SN: R58J401DQ1A
[ 3/21/2018 11:32:00 AM ] Chip name: EXYNOS3475
[ 3/21/2018 11:32:00 AM ] Módem: SHANNON308
[ 3/21/2018 11:32:00 AM ] Security patch: 2018-01-01
[ 3/21/2018 11:32:00 AM ] RF cal date: 20170401
[ 3/21/2018 11:32:00 AM ] IMEI: 356903083826771
[ 3/21/2018 11:32:00 AM ] Verificando derecho de Super Usuario... verdadero
[ 3/21/2018 11:33:00 AM ] Reading NV data... Listo
[ 3/21/2018 11:33:00 AM ] Checking NV data... Listo
[ 3/21/2018 11:33:00 AM ] Reading data... Listo
[ 3/21/2018 11:33:00 AM ] Detecting MODEM... Listo
[ 3/21/2018 11:33:00 AM ] Reading MODEM... Listo
[ 3/21/2018 11:33:00 AM ] Calculando... Listo
[ 3/21/2018 11:33:00 AM ] Initialization data... Listo
[ 3/21/2018 11:33:00 AM ] Writing zTool... Listo
[ 3/21/2018 11:33:00 AM ] Initialization zTool... Listo
[ 3/21/2018 11:33:00 AM ] Running zTool, please wait...
[ 3/21/2018 11:33:00 AM ] Start... Listo
[ 3/21/2018 11:33:00 AM ] Initialization... Listo
[ 3/21/2018 11:33:00 AM ] Generate and check client proof... Listo
[ 3/21/2018 11:33:00 AM ] Verify proof by client... Listo
[ 3/21/2018 11:33:00 AM ] Reading data... Listo
[ 3/21/2018 11:34:00 AM ] HWID: 67 CF 2F CA 91 E6 4F BD 69 3C 30 E1 E5 82 F1 4C
[ 3/21/2018 11:34:00 AM ] Calculando... Listo
[ 3/21/2018 11:34:00 AM ] Desbloquear... Listo
[ 3/21/2018 11:34:00 AM ] Writing NV data... Listo
[ 3/21/2018 11:34:00 AM ] Reiniciando teléfono ... Listo
[ 3/21/2018 11:34:00 AM ] Desbloqueo Listo