These are the instructions to root Samsung Galaxy Grand 2 SM-G7102 using Pre-rooted firmware (android 4.3) through Odin on Windows Computer.
Requirements: Your Samsung Galaxy Grand 2 SM-G7102 should have at least 30-40 percent of battery to perform the rooting process.
Step 1: Download and Install Samsung USB Driver on your computer. If in case, Samsung USB Driver is already installed on the computer then SKIP this Step.
Step 3: Now, Switch off your Phone.
Step 4: Now, you have to enable Download Mode on your phone. To enable download mode Press and hold Volume Down Key, Home Button and Power key at same time for 5-8 seconds (you have to press and hold all three buttons at same time) until download mode is not active.
Step 5: In the Download mode you will be able to see a Warning Yellow Triangle Sign. In this situation you have to press the Volume up key to continue.
Step 6: Now, Open Odin3 v3.09.exe (found in the extracted files, that you have downloaded in the Step#2) on your computer. Then connect your phone to the computer.
Step 7: Once you have connected the phone to the computer, Odin will automatically recognize the device and show “Added” message at the lower-left panel.
Step 8: Once your device detected by Odin, click on the PDA button and select the SM-G7102.tar file (you have downloaded this file in step#2).
Step 9: Now, click on the Start button in Odin to begin the Flashing.
Step 11: Once you see, the Pass message in Odin, you can disconnect your Device from the computer.
Step 12: Now, to make sure you have successfully rooted your Samsung Galaxy Grand 2 SM-G7102, open Applications Menu on your phone and Find SuperSU App. If this app exists on your phone, then it means you have successfully rooted your device. Congratulations.
Optional: You can also verify the root status of your device by using the Root Checker Application.
[*] Data loss process: Your Phone Data like contacts, pictures, videos, music and etc will be deleted after flashing the above pre-rooted firmware.
[*] Samsung Stock Firmware: If you are looking for the original firmware for your device, then head over to Download Samsung Stock Firmware page.
[*] Samsung USB Driver: If you are looking for the original USB Driver for your device, then head over to Download Samsung USB Driver page.
[*] Credits: Big thanks to Balliboxer (XDA Developer) for providing the pre-rooted ROM for Samsung Galaxy Grand 2 SM-G7102.