Samsung I9515 unlock Done by z3x with root file 4.4.2

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Root file 4.4.2 Download

 UNLOCK INSTRUCTIONS:
  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. Press 'Unlock' button for direct unlock