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con octopus frp seleccionar "epik one modelo k504" instalar los drivers spreadtrum de la pagina de octopus y conectar apagado presionando mientras se conecta a la computadora el botón volumen abajo.
aquí el log de la operación
Platform: EPIK ONE
Selected model: K504
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
No diagnostic ports found!
Operation was failed!
Performed by 1.8.7.0 Software version.
Initializing smartcard...
Serial: 0000088F83
Connecting to server...
Updating DB...
DB updated successfully
Platform: EPIK ONE
Selected model: K504
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM276
Connecting...
Mobile Status: SPRD3
Sending preloader...
Mobile Status: Spreadtrum Boot Block version 1.1
Sending mainloader...
Reading info...
Brand: EPIKONE
Model: K503
Device: K503
Android version: 8.1.0
Display ID: K503_EPIKONE_Generic_Dual_SW_1.0
Searching for signatures...
Resetting FRP lock..
FRP lock is successfully reseted!
Backup saved as EPIKONE_K503_05-03-2020_16-06-53.dump file
Performed by 1.8.7.0 Software version.
aquí el log de la operación
Platform: EPIK ONE
Selected model: K504
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
No diagnostic ports found!
Operation was failed!
Performed by 1.8.7.0 Software version.
Initializing smartcard...
Serial: 0000088F83
Connecting to server...
Updating DB...
DB updated successfully
Platform: EPIK ONE
Selected model: K504
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM276
Connecting...
Mobile Status: SPRD3
Sending preloader...
Mobile Status: Spreadtrum Boot Block version 1.1
Sending mainloader...
Reading info...
Brand: EPIKONE
Model: K503
Device: K503
Android version: 8.1.0
Display ID: K503_EPIKONE_Generic_Dual_SW_1.0
Searching for signatures...
Resetting FRP lock..
FRP lock is successfully reseted!
Backup saved as EPIKONE_K503_05-03-2020_16-06-53.dump file
Performed by 1.8.7.0 Software version.