1. Enable USB debugging 
  2. Root phone using Vroot
  3. Start AMDO.exe go to IMEI UNLOCK/DIAG TOOLS tab and press DIAG ADB ENABLE. (confirm on the phone screen ADB "Allow ADB")
  4. IN AMDO.exe go to SERVICE tab and press "Scan ports" then select the diagnostic port.
  5. Press DO JOB button and follow the software instructions.
  6. After unlocking power off the phone, insert SIM and phone must be unlocked