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lo que hice fue cargar software con android 7 y posteriormente hacer el frp con octopus y al 100 cuenta removida.
este es el link de descarga del software. y el procedimiento de la box.
Welcome to Octoplus/Octopus Box LG Software version 2.9.3
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG MTK
Selected port:
Selected baudrate: 921600
Selected model: M400MT
Selected USB connection type
Please, disconnect cable, reconnect battery, connect P999 cable (with
910k resistor)
or
Reconnect battery, press and hold "Vol+" for 10 seconds and connect
Micro USB cable.
Phone found at port COM25
Mode: Emergency
Initializing flash...OK
Model ID: LG-M400MT
Platform: mt6750
Android version: 7.0
SW version: LGM400MTAT-00-V10a-334-020-FEB-27-2019+6
LAF Version: 1.1
Product ID: VS01S170311005873
IMEI:
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
--------------------------------------------------------------------------------
IMEI: 356097-08-025282-4
Bluetooth address: A8:B8:6E:A7:C5:62
Wi-Fi MAC address: A8:B8:6E:11:36:86
SPC: 000000
--------------------------------------------------------------------------------
Opening "M400MT10a_03_TCL_MX_OP_0905.kdz"...OK
Firmware version: LGM400AT-00-V10o-GLOBAL-COM-SEP-05-2017+0
Firmware model: LG-M400
Sending signature...OK
Prepairing firmware...
Selecting firmware partitions...OK
Selected default partitions!OK
Setting options...OK
Reading partitions...OK
Do you want to format User Data?
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing 1/65 preloader_0.bin...OK
Writing 2/65 pgpt_0.bin...OK
Writing 3/65 lk_98304.bin...OK
Writing 4/65 lk2_100352.bin...OK
Writing 5/65 laf_102400.bin...OK
Writing 6/65 boot_160768.bin...OK
Writing 7/65 recovery_196608.bin...OK
Writing 8/65 logo_294912.bin...OK
Writing 9/65 lo_bak_go_311296.bin...OK
Writing 10/65 secro_393216.bin...OK
Writing 11/65 tee1_421888.bin...OK
Writing 12/65 tee2_432128.bin...OK
Writing 13/65 rct_526336.bin...OK
Writing 14/65 factory_528384.bin...OK
Writing 15/65 efuse_643072.bin...OK
Writing 16/65 md1img_901120.bin...OK
Writing 17/65 md1dsp_950272.bin...OK
Writing 18/65 md1arm7_958464.bin...OK
Writing 19/65 md3img_964608.bin...OK
Writing 20/65 cust_974848.bin...OK
Writing 21/65 system_1196032.bin...OK
Writing 22/65 system_1459200.bin...OK
Writing 23/65 system_1463296.bin...OK
Writing 24/65 system_1723392.bin...OK
Writing 25/65 system_1983488.bin...OK
Writing 26/65 system_1987584.bin...OK
Writing 27/65 system_2247680.bin...OK
Writing 28/65 system_2507776.bin...OK
Writing 29/65 system_2511872.bin...OK
Writing 30/65 system_2771968.bin...OK
Writing 31/65 system_3031040.bin...OK
Writing 32/65 system_3032064.bin...OK
Writing 33/65 system_3036160.bin...OK
Writing 34/65 system_3296256.bin...OK
Writing 35/65 system_3556352.bin...OK
Writing 36/65 system_3560448.bin...OK
Writing 37/65 system_3820544.bin...OK
Writing 38/65 system_4082688.bin...OK
Writing 39/65 system_4344832.bin...OK
Writing 40/65 system_4606976.bin...OK
Writing 41/65 system_4869120.bin...OK
Writing 42/65 system_5131264.bin...OK
Writing 43/65 system_5393408.bin...OK
Writing 44/65 system_5655552.bin...OK
Writing 45/65 system_5917696.bin...OK
Writing 46/65 system_6179840.bin...OK
Writing 47/65 system_6441984.bin...OK
Writing 48/65 system_6704128.bin...OK
Writing 49/65 system_6966272.bin...OK
Writing 50/65 system_7228416.bin...OK
Writing 51/65 system_7490560.bin...OK
Writing 52/65 system_7750656.bin...OK
Writing 53/65 system_7754752.bin...OK
Writing 54/65 system_8014848.bin...OK
Writing 55/65 system_8273920.bin...OK
Writing 56/65 system_8274944.bin...OK
Writing 57/65 system_8279040.bin...OK
Writing 58/65 system_8798208.bin...OK
Writing 59/65 system_8801280.bin...OK
Writing 60/65 lafbak_10158080.bin...OK
Writing 62/65 0_OP_TCL_MX.img...OK
Writing 63/65 1_OP_TCL_MX.img...OK
Writing 64/65 2_OP_TCL_MX.img...OK
Writing 65/65 3_OP_TCL_MX.img...OK
Formating RCT...OK
Finalizing...OK
Performed by 2.9.3 Software version.
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG MTK
Selected port:
Selected baudrate: 0
Selected model: M400MT
Selected USB connection type
Please, disconnect cable, reconnect battery, connect P999 cable (with
910k resistor)
or
Reconnect battery, press and hold "Vol+" for 10 seconds and connect
Micro USB cable.
Phone found at port COM25
Mode: Emergency
Initializing flash...OK
Model ID: LG-M400MT
Platform: mt6750
Android version: 7.0
SW version: LGM400MTAT-00-V10a-334-020-SEP-05-2017+3
LAF Version: 1.1
Product ID: VS01S170311005873
IMEI:
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
--------------------------------------------------------------------------------
IMEI: 356097-08-025282-4
Bluetooth address: A8:B8:6E:A7:C5:62
Wi-Fi MAC address: A8:B8:6E:11:36:86
SPC: 000000
--------------------------------------------------------------------------------
Detecting writing method...
LAF Error: 80000121.
Trying second method...OK
Reset FRP operation for M400MT will delete all user data on the phone
(contacts, pictures and others)!
Do You want to continue?
Resetting FRP Lock...
Writing loader...OK
Writing userdata...OK
Formating encrypt...OK
Restoring loader...OK
Resetting FRP lock successfully completed!
Rebooting phone...
To complete the operation, please make Factory Reset (Go to "Settings" ->
"General" -> "Backup & reset" -> "Factory data reset", press "Reset
phone" and "Erase everything" buttons).
Performed by 2.9.3 Software version.
este es el link de descarga del software. y el procedimiento de la box.
Debes estar registrado para ver los enlaces
Welcome to Octoplus/Octopus Box LG Software version 2.9.3
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG MTK
Selected port:
Selected baudrate: 921600
Selected model: M400MT
Selected USB connection type
Please, disconnect cable, reconnect battery, connect P999 cable (with
910k resistor)
or
Reconnect battery, press and hold "Vol+" for 10 seconds and connect
Micro USB cable.
Phone found at port COM25
Mode: Emergency
Initializing flash...OK
Model ID: LG-M400MT
Platform: mt6750
Android version: 7.0
SW version: LGM400MTAT-00-V10a-334-020-FEB-27-2019+6
LAF Version: 1.1
Product ID: VS01S170311005873
IMEI:
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
--------------------------------------------------------------------------------
IMEI: 356097-08-025282-4
Bluetooth address: A8:B8:6E:A7:C5:62
Wi-Fi MAC address: A8:B8:6E:11:36:86
SPC: 000000
--------------------------------------------------------------------------------
Opening "M400MT10a_03_TCL_MX_OP_0905.kdz"...OK
Firmware version: LGM400AT-00-V10o-GLOBAL-COM-SEP-05-2017+0
Firmware model: LG-M400
Sending signature...OK
Prepairing firmware...
Selecting firmware partitions...OK
Selected default partitions!OK
Setting options...OK
Reading partitions...OK
Do you want to format User Data?
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing 1/65 preloader_0.bin...OK
Writing 2/65 pgpt_0.bin...OK
Writing 3/65 lk_98304.bin...OK
Writing 4/65 lk2_100352.bin...OK
Writing 5/65 laf_102400.bin...OK
Writing 6/65 boot_160768.bin...OK
Writing 7/65 recovery_196608.bin...OK
Writing 8/65 logo_294912.bin...OK
Writing 9/65 lo_bak_go_311296.bin...OK
Writing 10/65 secro_393216.bin...OK
Writing 11/65 tee1_421888.bin...OK
Writing 12/65 tee2_432128.bin...OK
Writing 13/65 rct_526336.bin...OK
Writing 14/65 factory_528384.bin...OK
Writing 15/65 efuse_643072.bin...OK
Writing 16/65 md1img_901120.bin...OK
Writing 17/65 md1dsp_950272.bin...OK
Writing 18/65 md1arm7_958464.bin...OK
Writing 19/65 md3img_964608.bin...OK
Writing 20/65 cust_974848.bin...OK
Writing 21/65 system_1196032.bin...OK
Writing 22/65 system_1459200.bin...OK
Writing 23/65 system_1463296.bin...OK
Writing 24/65 system_1723392.bin...OK
Writing 25/65 system_1983488.bin...OK
Writing 26/65 system_1987584.bin...OK
Writing 27/65 system_2247680.bin...OK
Writing 28/65 system_2507776.bin...OK
Writing 29/65 system_2511872.bin...OK
Writing 30/65 system_2771968.bin...OK
Writing 31/65 system_3031040.bin...OK
Writing 32/65 system_3032064.bin...OK
Writing 33/65 system_3036160.bin...OK
Writing 34/65 system_3296256.bin...OK
Writing 35/65 system_3556352.bin...OK
Writing 36/65 system_3560448.bin...OK
Writing 37/65 system_3820544.bin...OK
Writing 38/65 system_4082688.bin...OK
Writing 39/65 system_4344832.bin...OK
Writing 40/65 system_4606976.bin...OK
Writing 41/65 system_4869120.bin...OK
Writing 42/65 system_5131264.bin...OK
Writing 43/65 system_5393408.bin...OK
Writing 44/65 system_5655552.bin...OK
Writing 45/65 system_5917696.bin...OK
Writing 46/65 system_6179840.bin...OK
Writing 47/65 system_6441984.bin...OK
Writing 48/65 system_6704128.bin...OK
Writing 49/65 system_6966272.bin...OK
Writing 50/65 system_7228416.bin...OK
Writing 51/65 system_7490560.bin...OK
Writing 52/65 system_7750656.bin...OK
Writing 53/65 system_7754752.bin...OK
Writing 54/65 system_8014848.bin...OK
Writing 55/65 system_8273920.bin...OK
Writing 56/65 system_8274944.bin...OK
Writing 57/65 system_8279040.bin...OK
Writing 58/65 system_8798208.bin...OK
Writing 59/65 system_8801280.bin...OK
Writing 60/65 lafbak_10158080.bin...OK
Writing 62/65 0_OP_TCL_MX.img...OK
Writing 63/65 1_OP_TCL_MX.img...OK
Writing 64/65 2_OP_TCL_MX.img...OK
Writing 65/65 3_OP_TCL_MX.img...OK
Formating RCT...OK
Finalizing...OK
Performed by 2.9.3 Software version.
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG MTK
Selected port:
Selected baudrate: 0
Selected model: M400MT
Selected USB connection type
Please, disconnect cable, reconnect battery, connect P999 cable (with
910k resistor)
or
Reconnect battery, press and hold "Vol+" for 10 seconds and connect
Micro USB cable.
Phone found at port COM25
Mode: Emergency
Initializing flash...OK
Model ID: LG-M400MT
Platform: mt6750
Android version: 7.0
SW version: LGM400MTAT-00-V10a-334-020-SEP-05-2017+3
LAF Version: 1.1
Product ID: VS01S170311005873
IMEI:
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
--------------------------------------------------------------------------------
IMEI: 356097-08-025282-4
Bluetooth address: A8:B8:6E:A7:C5:62
Wi-Fi MAC address: A8:B8:6E:11:36:86
SPC: 000000
--------------------------------------------------------------------------------
Detecting writing method...
LAF Error: 80000121.
Trying second method...OK
Reset FRP operation for M400MT will delete all user data on the phone
(contacts, pictures and others)!
Do You want to continue?
Resetting FRP Lock...
Writing loader...OK
Writing userdata...OK
Formating encrypt...OK
Restoring loader...OK
Resetting FRP lock successfully completed!
Rebooting phone...
To complete the operation, please make Factory Reset (Go to "Settings" ->
"General" -> "Backup & reset" -> "Factory data reset", press "Reset
phone" and "Erase everything" buttons).
Performed by 2.9.3 Software version.