(1).  First you need to go in developer's options which is hidden in your phone. To unhide            the developer's options in settings. You need to go to settings>About phone, and tap on        Build number 10 times

When you successfully unhide the developer's options a new setting tile will appear as developer's options tap on this tile then find usb debugging. Check usb debugging. See picture above.

Now you are ready to go

(2).    Now you need to install Motorola USB drivers

        Click here to download latest drivers

        After installing motorola drivers Power off your phone

(3).    After switch off your phone press power and volume down button simultaneously for              few seconds 

After few seconds your phone will switch on in bootloader mode just like below picture.

(4).   Connect data cable to your computer and plug it into your phone. Computer                           automatically starts installing drivers. then you will need adb and fastboot drivers

    

        Click Here to download fastboot drivers. Install drivers and go to your computer's C               drive you will find adb folder inside C drive. Open adb folder and hold shift button and         Right Click on plain area you will see an option open command window here click on           it, and a command window will appear.

       then type fastboot devices and hit enter

    you will find this

    then you have to type fastboot oem get_unlock_data

      you will find this

      select the highlighted arear and paste it in notepad [Right Click-Mark- Mark the text by                  pressing the shift key-Now press Ctrl+C] and remove the empty space then go to this                link https://motorola-global-portal.custhelp.com/app/standalone%2Fbootloader%2Funlock-your-device-a/session/L3RpbWUvMTQ4NDU2OTQxOS9zaWQvQ1hTallQOG4= and create an account. 

(a).      Scroll down the page and paste the copied string in the field. Then click on ‘Can my device be                unlocked?’, after which a "REQUEST UNLOCK KEY" button will appear at the bottom of                           page. To get your unlock key, select the ‘I Agree’ option. Note: You will receive an email with                   your Unlock Key at the email address you used to log in there.

(b).      Important – Copy the 20-character key that Motorola sent you via email. Make sure                                 your device is connected.

(c).     Then in CMD type: fastboot devices (To check your device is connected)

(d).      Then type: fastboot oem unlock UNIQUE_KEY and hit enter

 After few seconds a warning will appear "BOOTLOADER UNLOCKED" that's it