How to Root Samsung i9100 [Root]
Device powered ON At least 50% battery level Internet connection necessary USB Cable (the original one recommended)
Step 1: Free download and install Kingo Android Root.
Kingo offers the best one-click Android root software for free. Just download and install it now.
Step 2: Double click the desktop icon of Kingo Android Root and launch it.
After launching Kingo Android Root, you will see its interface as shown below.
Step 3: Plug your Android device into your computer via USB cable.
If your device driver is not installed on your Computer, Kingo will install it for you automatically. Make sure you get Internet conenction so that device driver can be downloaded. If you are using Windows 8, you may need to change some settings first. When running Kingo Android Root on Windows 8, the issue you may most likely encounter is driver installation looping.
How to solve driver installation looping on Windows 8 when running Kingo Android Root?
Step 4: Enable USB Debugging mode on your Android device.
USB Debugging mode enabled is a necessary step of Android rooting process. What is USB Debugging Mode? How to enable USB Debugging mode? INPORTANT: Pay attention to your device screen for a prompt window. Tick "Always allow from this computer". If you don't, you will probably get yourself an OFFLINE DEVICE. 
Step 5: Read notifications carefully before rooting your device.
Android rooting is nothing big. However, it is not exactly a small issue either. Rooting your device may open a door for you, and yet with risks.
Android rooting is a modification process to the original system, in which the limitations are removed and full-access is allowed and thus resulting in the ability to alter or replace system applications and settings, run specialized apps and even facilitate the removal and replacement of the device's operating system with a custom one. Rooting your device will immediately void your warranty... Click to know more about Android Rooting.
Step 6: Click "ROOT" to root your device.
Kingo Android Root will employ multiple exploits on your device, which will probably take a couple of minutes. In the rooting process, your device may be rebooted several times. Do not be panic, it is perfectly normal. And once it begins, please DO NOT touch, move, unplug or perform any operation on your device. 
Step 7: Root succeeded, click "Finish" to reboot your device.
Hopefully your device is well supported and successfully rooted by Kingo. Until your device reboots itself, do not operate.
Step 8: Check the root status of your device.
Normally, you will find an app named SuperSU installed on your device after successful rooting.
