This is very easy way to root and install Superuser to your Galaxy S3. fallow this steps...... 1.You need download GT-I9300 this SHV-E210K this SHV-E210L this SHV-E210S this 2.Open Odin3-v3.10.6.exe 3.Click "AP" and add "CF-Auto-Root-m0-m0xx-gti9300.tar.md5" 4.Now turn off your phone Press and hold Volume down+ Home+ Power button Release the buttons after 'warning!!' Press Volume up and Connect to the USB cable 5.Click Start in Odin Done.... Your Device Rooted After the reboot Source : autoroot.chainfire.eu
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