Easy Unlock samsung G531H with Z3X.
It’s no need to root
Power on mobile phone.Open setting>About phone>tap 7 times on Build number
Go back and tap developer option>tap OEM unlocking and tap Usb debugging
Connect z3x and open z3x pro tool latest version.
Click on search button type G531H and hit enter button
Click on unlock option.
Connect to the mobile with usb cable install driver if needed.
Select com port and click on read code option read process will start wait a second.
Not the net lock code form z3x tool and then insert the sim card on mobile and power on it.
Mobile show network lock code to input,then input the code which was found from read code option.
Then tap unlock button. You can see unlock successful your mobile is fully unlocked.