1. Root Device using latest Kingo-Android Root --->DL here: http://kingo-android-root.soft112.com/download.html
2. On USB Debug
3. Dial *#0808#, Select "DM + MODEM + ADB" tap ok and restart the Phone.
4. Find port tab (SAMSUNG Mobile USB Serial Port COM xxx) Select "Model: SM-N900A"
5. Click "Wipe EFS" Then LOG show....

6. Write Cert file -----> DL here : http://www.4shared.com/file/ehMrwWL2...26_S20001.html
Wait for completed...

Phone is 100% Unlocked & 3G, 4G Networks also working.....
Note: I used Cert file of SM-N900, and the IMEI will change but it is ok the Z3X not supported as of now...
2. On USB Debug
3. Dial *#0808#, Select "DM + MODEM + ADB" tap ok and restart the Phone.
4. Find port tab (SAMSUNG Mobile USB Serial Port COM xxx) Select "Model: SM-N900A"
5. Click "Wipe EFS" Then LOG show....

6. Write Cert file -----> DL here : http://www.4shared.com/file/ehMrwWL2...26_S20001.html
Wait for completed...

Phone is 100% Unlocked & 3G, 4G Networks also working.....
Note: I used Cert file of SM-N900, and the IMEI will change but it is ok the Z3X not supported as of now...