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aqui les dejo el proceso que acabo de hacerle a este modelito,con el modulo nck spd ,cabe destacar que estos modelos estan llegando de chil y peru donde son bastante famosos ,
Conectarlo con volumen (-)
SELECTED: SC7720EA_EMMC 5.x
ACTION: Unlock Phone
Start Detect phone.
Phone must be off with battery inside.
Long press "VOL -" key while inserting usb cable.
For some phones need to
Long press "VOL -"+ "VOL +" key while inserting usb cable.
Keep key untill boot complete.
Detected: SCI USB2Serial (COM4)
BOOT: SPRD3
Sending loader, keep boot key untill loader start.
Loader OK: Spreadtrum Boot Block version 1.1
Changing bautrate OK.
Send Second Loader.
Reading extended info, wait...
FileSystem: EMMC
Manufacturer: Avvio
Hardware: 1611_HD405D
Platform: sc8830
Board: ctl1611
Build Id: NRD90M
Model: Avvio_A400
Android Release: 7.0
Android Version: NRD90M release-keys
IMEI 1: 352117xxxxxxxxxx
IMEI 2: 867400xxxxxxxxxx
SIMLOCK USER DATA
Simlock Status: LOCKED[1] Simlock Counter:[0]
Ex Locks: 0
SIMLOCK USER DATA END
Simlock Type: 3
Start write unlock, wait...
Total Time: 00:00:32
Done.
Conectarlo con volumen (-)
SELECTED: SC7720EA_EMMC 5.x
ACTION: Unlock Phone
Start Detect phone.
Phone must be off with battery inside.
Long press "VOL -" key while inserting usb cable.
For some phones need to
Long press "VOL -"+ "VOL +" key while inserting usb cable.
Keep key untill boot complete.
Detected: SCI USB2Serial (COM4)
BOOT: SPRD3
Sending loader, keep boot key untill loader start.
Loader OK: Spreadtrum Boot Block version 1.1
Changing bautrate OK.
Send Second Loader.
Reading extended info, wait...
FileSystem: EMMC
Manufacturer: Avvio
Hardware: 1611_HD405D
Platform: sc8830
Board: ctl1611
Build Id: NRD90M
Model: Avvio_A400
Android Release: 7.0
Android Version: NRD90M release-keys
IMEI 1: 352117xxxxxxxxxx
IMEI 2: 867400xxxxxxxxxx
SIMLOCK USER DATA
Simlock Status: LOCKED[1] Simlock Counter:[0]
Ex Locks: 0
SIMLOCK USER DATA END
Simlock Type: 3
Start write unlock, wait...
Total Time: 00:00:32
Done.
