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Here’s an updated root method for rooting your Galaxy S3 GT-i9300. Please do not use this root method unless you have GT-i9300 international model. If you didn’t buy your Galaxy S3 in the U.S. or Canada, you most likely have the GT-i9300.
For AT&T, Sprint, T-Mobile, and T-Mobile Galaxy S3 (or Canadian dual-core S3), please see How to Root U.S./Canadian Galaxy S3!
For Verizon, please see How to Root Verizon Galaxy S3 SCH-I535 instead!
Step 1. Power off your Galaxy S3. Then hold down Volume Down, Center Home, and Power buttons together until you see the warning screen.
Step 2. Hit Volume Up button to enter Download ODIN mode and connect a microUSB cable from your Galaxy S3 to your computer.
Step 3. Next, download GalaxyS3RootNew.zip, unzip the files and run odin3v1.85.exe by double-clicking on the file. (Don’t have unzipping program? Download and install 7Zip.)
Step 4. When ODIN program opens, you should find a highlighted yellow box with a random COM number. If you don’t see this, download and install Samsung USB drivers below:
Download Samsung USB drivers
Step 5. DO NOT TOUCH ANYTHING ELSE, hit “PDA” button and select the file CF-Root-SGS3-v6.4.tar.
Step 6. Hit “Start” button. This will install ClockworkMod Recovery on your Galaxy S3 i9300. If you get stuck on this step, just try a different USB port.
Step 7. Once ODIN is done flashing, you will see “PASS!” in green highlighted box.
Step 8. Your Galaxy S3 will reboot once into CWM Recovery and automatically install root and Superuser app.
Step 9. Once your phone reboots, you will find an app called “SuperSU”, this is your superuser app.
Step 10. Download and install Titanium Backup app from Play Store to verify you have root, a Superuser request window should pop up.
That’s it! This should take you less than 5 minutes to do and does not affect your phone in any way but give you Superuser, root, and custom ClockworkMod Recovery.
I highly recommend you to boot into ClockworkMod Recovery and make your first backup ROM at this point, which will save everything including the stock ROM, your apps and settings.
Q: Does this root method erase my settings and apps?
A: No, it doesn’t touch a thing, very safe to do.
Q: ODIN does not start on my computer, what do I do?
A: Sometimes various Windows programs and drivers interfere with ODIN, try closing/killing any programs before running the program. Try on a different USB port first. If that does’t work, just use another computer.
Q: I ended up in Kernel panic mode, what do I do?
A: Relax, that’s same as ODIN download mode, simply run ODIN again and flash the files again, it will work.
Q: Does rooting break my phone in any way?
A: No, this root method actually does not change your Galaxy S3 except install custom recovery and give you root. Everything else on your phone will stay the same.
Q: Can I still get OTA updates after rooting?
A: Yes, you can simply by re-install stock recovery.
More questions? Please leave in the comment section below for help from author and other users.
More on this Root Method
This root method simply installs ClockworkMod Recovery to the recovery partition and installs Superuser zip file, very safe to do. With Galaxy S2, recovery partition was part of the kernel and was a bit dangerous but with Galaxy S3, Samsung has made recovery parition separate from the kernel, making it much safer just like how Galaxy Nexus works.
Credits – ChainFire at XDA for Awesome Recovery!Need Help? Follow/add me on Google+, Facebook, or Twitter!
Galaxy S3 Reference
You will need a rooted Galaxy S3 to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF GALAXY S3! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
First time to rooting and custom ROMs? Please see our Galaxy S3 Root FAQ FIRST! Note: T-Mobile Galaxy S3 ROMs are compatible with Canadian Wind, Mobilicity, and Videotron Galaxy S3s.
AT&T Galaxy S3 ROMs are compatible with Canadian Bell, Telus, and Sasktel Galaxy S3s.