I found the easiest way to unlock this thing.

1. *#0808#
choose DM+MODEM+ADB ( the last option)
2. *#9090#
chose the fourth option which is DM over UART even if u are using USB cable. sounds weird but it is what it is :P
3. make sure the debugging thing is on. gogole it if you dont know how. it is easy
4. download impactor. here is the link
http://www.cydiaimpactor.com/
after you download this software, plug the device in the computer and make sure you download the drivers. good luck with that. lol
5. sign in to google play and download superSU
6. run the app and choose normal when this option comes.
7. turn on z3x and choose the right usb port
8. read info
9. read codes.
BINGO
Selected model: I337
Selected port: COM58 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Reading phone info... no answer from phone
Done with Samsung Tool v.16.3

Selected model: I337
Selected port: COM59 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Reading phone info...
Build: M9615A-CEFWTAZM-4.0.17062
Done with Samsung Tool v.16.3

Selected model: I337
Selected port: COM59 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Reading phone info...
Build: M9615A-CEFWTAZM-4.0.17062
Reading security... OK
Searching server... OK
NET lock: #7465625*638*84090938#
Sub lock: #7465625*782*00000000#
SP lock: #7465625*77*00000000#
CP lock: #7465625*27*00000000#
For check lock status: *#7465625#
Done with Samsung Tool v.16.3

if you need help, just ask :roll: