how to unlock lg ls675 boost mobile

please help how to unlock

i try but still next process

Checking data…OK
Platform: LG Qualcomm
Selected port: COM28
Selected model: LS675
Reading info…Failed!
Port busy
Initializing ADB…OK
Waiting for phone…OK
Model ID: LGLS675
Firmware version: LGLS675AT-00-ZV5-SPR-US-FEB-25-2016-ARB00+02
Kernel version: 3.10.49-ge3e9265 (lgmobile@LGEACI5R3) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Thu Feb 25 13:05:07 KST 201
Android version: 5.1.1
Hardware: Qualcomm Technologies, Inc MSM8909 0
Please, type ##3424# to get SPC / MSL / Service Code…OK
Input 355355, go to "Diag" menu and select "Enable" option.
Performed by 2.4.7 Software version.

pls help thanks for regard