These are the instructions to root Samsung Galaxy Grand Duos GT-I9082 (running on android 4.2.2) using Root Genius Application on Windows Computer.
Requirements: If you are using any antivirus application on your computer, then disable it first before following the below instructions. As because Antivirus interrupts the rooting procedure.
(Developers Option is hidden for Android 4.2.2 or above, to show this option Go to Settings > About Phone > Built Number (Tap on it for 5-8 times).
Optional: You can also verify the root status of your device by using the Root Checker Application.
[*] No data loss process: Your Samsung Galaxy Grand Duos GT-I9082 Phone Data like contacts, pictures, videos, music and etc will be not affected with this method.
[*] Warranty Void: Your Samsung Galaxy Grand Duos GT-I9082 Device Warranty may be Void after following the above tutorial.
[*] 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: Root Genius Application was created by SJRoot (Developer). So full credit goes to them for sharing the tool for free.