Step 6. Once you complete the steps correctly you will receive a 16-digit bootloader unlock ID.
Step 7. Now download adb and fastboot files.[sociallocker] link [/sociallocker]
Step 8. Power off your phone.
Step 9. Press volume down button and now connect your phone to pc/laptop via data cable. Your phone will be in bootloader mode now.
Step 10. Extract the adb.zip file. Open adb folder. Press Shift and right click. You will get an option “Open Command window here”.
Step 11. Type
fastboot oem unlock xxxxxxxxxxxxxxxx Hit enter.
Replace xxxxxx with the unique bootloader key.
Now you have successfully unlocked the bootloader.
For any queries comment below would be happy to help you :).