unlocking bootloader

[AC Question]

hey please help i am unable to unlock boot loader of my coolpad note 5 which has snapdragon 617 soc, no unlock code type help or instruction on official forum and no help there because all command returns as unknown command ,
i tried many command except these two command all return unknown command ,
fastboot devices works shows device no
fast getvar all works showing something

i checked all driver installed properly and pc showing it on device manager as fastboot device even fastboot recognized it as a fastboot devices, also i allow oem unlocking on developer setting and enabled usb debugging
after this all command like
fastboot oem unlock
fastboot oem unlock-go
fastboot boot
fastboot reboot
fastboot flashing unlock
fastboot oem device-info
fastboot flash

all and more i found i net returns unknown command remote

i tried with vendor id but no result
i checked fastboot getvar all returns its kernal as lk
so do little kernel has problem , i have its firmware package but not found aboot.c
please help its unrooted