"UNLOCK INSTRUCTIONS:
    Phone must be rooted!
  If the software can't root the phone automatically, 
  then you must root your device manually.
  1. Power on the phone.
  2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
     go to 'Settings'-'Developer options' and enable 'USB debugging'.
  3. Connect the phone to PC with USB cable, install drivers if needed.
  4. Select device in ADB settings.
  5. Press 'Unlock' button.

Done with Samsung Tool PRO v.30.5"