1- Open Z3X shell and select model no. GT-S7392.
2- Samsung Tool interface will appear.
3- Click on select which will take you to Flash section.
4- Select Files like- Boot, PDA, Phone, CSC.
5- Switch off the phone, Press & Hold Power+Volume down+Home to enter in download mode.
6- Connect mobile to PC using USB (Install driver).
7- Click on Flash to start flashing.
8- Flashing done will appear when flashing is completed.