For those of you who want to root your AT&T Galaxy S3 SGH-I747, here’s a step-by-step guide plus video tutorial (using SGH-I747). Anyone with even slight knowledge of computer should be able to do this easily. This guide is noob-proof and my suggestion is to follow the video and the guide one step at a time.
Step 1. Hold Down Volume Down, Center Home, and Power buttons together for about 10 seconds.
Step 2. When your phone resets (screen goes off), let go of the Power button but keep holding down the other buttons.
Step 3. When you see a warning screen like below, hit Volume Up button.
Step 4. Once in Download mode, connect microUSB cable from your AT&T Galaxy S3 SGH-I747 to your computer.
Step 5. Download GalaxyS3RootATT.zip and unzip, you should fine 4 files and everything you need to root your AT&T Galaxy S3 SGH-I747.
Step 6. Double-click on the file “odin3 v1.85.exe” to start the ODIN program. You should see a yellow-highlighted box with a number. If you don’t, download and install Samsung Kies, then unplug/plug your phone back in; you should see it now.
Step 7. PLEASE DON’T TOUCH ANYTHING ELSE but click on “PDA” then choose the file “CWM-Recovery.tar” and hit “Start”. That’s it!
Step 8. You should get a “PASS!” and your phone will reboot.
Step 9. Once rebooted, copy the file “CWM-SuperSU-v0.87.zip” to anywhere on your phone.
Step 10. Hold down Volume Up, Center Home, and Power button together for about 10 seconds.
Step 11. Once your phone resets (screen goes off), let go of the Power button but keep holding down others.
Step 12. Once in ClockworkMod Recovery (also known as CWM Recovery), choose “install zip from sdcard”.
Step 13. Next choose “choose zip from sdcard” or “choose zip from internal sdcard”, depending on where you copied the file over to earlier.
Step 14. Choose the file “CWM-SuperSU-v0.87.zip”.
Step 15. Choose “yes”.
Step 16. You should see something like below:
Step 17. Reboot your phone and your AT&T Galaxy S3 SGH-I747 is now fully rooted and with SuperSU app, which is the Superuser app.
Q: Does this root method erase my settings and apps?
A: No, it doesn’t touch a thing, very safe to do.
Q: I ended up in Kernel panic mode, what do I do?
A: Relax, that’s same as ODIN download mode, simply run Heimdall again and flash the files again, it will work.
Q: I don’t get ClockworkMod Recovery like you do, just get Android with belly open.
A: If you’ve updated to newer software update, the stock OS will over-write ClockworkMod Recovery on reboot. To fix this, make sure “auto-reboot” is checked off in ODIN, then take the battery out when it’s done flashing in ODIN. Then enter ClockworkMod Recovery right away.
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.
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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.