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Solution ------ This is what worked for me. Success on 3 phones. *****Disclaimer, I am not a Pro at Z3X nor due I claim to be, these are the steps I used and I am only sharing my research to help others that may have similar issue***** The main issue I was having was that I would get an Error when trying to bypass MSL. what is happening here is that the UART Port is not configured properly. You may notice that when you dial *#7284# to enter PhoneUtil that all options are blank. PhoneUtil options should be set UART to PDA and USB to Modem. Keep in mind that if you do not have these setting right you will get Bypassing MSL: ERROR. If you receive an error the phone will restart and you must enter PhoneUtil again and set the UART and USB options again. Now Lets Start -------------------- 1. First thing you should do is turn on USB debugging mode in Developer options 2. Turn on Unknown Sources in the Security tab 3. Use Cydia Impactor, this will root your phone but keep in mind that you will not have a Super User app, Cydia Impactor only roots to let Z3X modify phone, just connect phone to usb port on computer and press start, Impactor will root phone. 4. Dial *#7284# set UART to PDA and USB to Modem, click Save and Reset, this will power off your phone and enable the settings you chose. 5. Start Z3X Samsung Tool v16.0, selecting T599N, the port should be set to Z3X Box Serial Port. 6. Connect USB cable from phone to USB port on Z3X Box also connect RJ-45 UART Cable to Z3X as you will need to switch during unlock (I used C3300K and S7070, both cables worked) 7. Click on unlock - watch Log area of screen and be prepared to switch from USB to UART when prompted After process is complete phone will restart - at that point if you have not previously inserted a different carrier sim you must do so now, enter 00000000 and Done!!! I hope this helps.