TOOLS:
MICRO USB CABLE
Z3X SAMSUNG
PROCEDURE:
1.Turn on the phone with or without original sim then go to settings-development-turn on USB Debugging.
2.RUN SAMSUNG TOOL V.14.4
3.Connect Micro Usb cable to phone then wait until driver installed.
4.Tick Read Codes for auto rooting
5.Tick Unlock and your phone will be UNLOCKED
ENJOY.........
THANKS Z3X TEAM