https://www.getdroidtips.com/unlock-bootloader-huawei-y6-2018/
Steps to Unlock Bootloader on Huawei Y6 2018:
First of all, enable the Developer Option
To Enable the Developer Option, Go to your Settings --> System -> About Phone -> Now Tap on the Build Number 7-8 Times until you see a toast message “Developer option enabled“
Now go to Developer option in the settings andEnableOEM unlock
Once you have got the unlock code, then save the unlock code somewhere safe
Now open the extracted folder ofHuawei Unlock Bootloader tool
Open the command.batand select thelanguage
Select language and hit enter (Hit Enter 2 TIMES)
Now you will be asked for a code.
Turn off your phone and Press Volume Up and Power button simultaneously to open Fastboot mode
Now connect the phone to PC using USB Cable
Now paste the Code which you got from FunkyHuawei mail and paste it here. Done! Your phone will be unlocked.