1. Enable USB debugging ( go to setting/device/get info about your fire and tap 7 times onmodel number for enable Developer options)
  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 Qualcomm diagnostic port.  (my pc automatically found drivers, I think been used ordinary Qualcomm drivers). Phone must be without SIM inside.
  5. Press DO JOB button and follow the software instructions.
  6. After unlocking power off the phone, insert SIM and phone must be unlocked