problem with flash lg k series

Does not flash with Octa failed



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Checking data...OK
Platform: LG MTK
Selected port: COM37
Selected baudrate: 921600
Selected model: K350Z
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 COM212
Mode: Emergency
Initializing flash...OK
Model ID: LG-K350Z
SW version: LGK350ZAT-00-V13v-GLOBAL-COM-JAN-24-2018+0
LAF Version: 1.1
Product ID: 0000000
IMEI: 00000
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
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--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Writing phone firmware without real necessity is at your own risk.

Downgrade may lead to phone damage!

Please, make sure the phone's battery is fully charged.
Disconnect all other devices from the computer (including phones,
modems, etc.) and close all other running programs.
To avoid errors in the flashing process, use a clean PC (without
any installed drivers for other Qualcomm-based devices).
You should not run any other programs or attach new devices to
your computer during the flashing!
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Opening "K350Z10h_00_0124.oct"...OK
Setting options...OK
Reading partitions...OK
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing preloader...Failed!
Performed by 2.8.5 Software version.
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG MTK
Selected port: COM37
Selected baudrate: 921600
Selected model: K350Z
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 COM126
Mode: Emergency
Initializing flash...OK
Model ID: LG-K350Z
SW version: LGK350ZAT-00-V13v-GLOBAL-COM-JAN-24-2018+0
LAF Version: 1.1
Product ID: 000000
Target operator: GLOBAL
Hardware: rev_10
Battery level: 50%
Reading partitions...OK
Checking security...
Checking security passed!
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Writing phone firmware without real necessity is at your own risk.

Downgrade may lead to phone damage!

Please, make sure the phone's battery is fully charged.
Disconnect all other devices from the computer (including phones,
modems, etc.) and close all other running programs.
To avoid errors in the flashing process, use a clean PC (without
any installed drivers for other Qualcomm-based devices).
You should not run any other programs or attach new devices to
your computer during the flashing!
--------------------------------------------------------------------------------
Opening "K350Z10h_00_0124.oct"...OK
Setting options...OK
Reading partitions...OK
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing preloader...Failed!
Performed by 2.8.5 Software version.