So, you want to unroot/unbrick your AT&T Galaxy Note SGH-i717? You can easily get your Galaxy Note completely back to stock Android 2.3.6. If ICS comes out by the time you read this, you can still use this method then use Samsung Kies or the software update function on the phone to get back to stock ICS.
Step 1. Put your Galaxy Note SGH-i717 into download mode by holding down Volume Down button and Power button. When your screen goes off, keep holding down Volume Down button but let go of Power button.
Step 2. When you see the warning sign, hit Volume Up button to enter download mode.
Step 3. Connect a micro-USB cable to your AT&T Galaxy Note from your computer.
Step 4. Download attstockrom.zip and unzip, you should get a file called attstockrom.tar.
Step 5. Download ODIN program, unzip and run the program.
Step 6. When ODIN runs, you should see a yellow highlighted COM thingee. If you don’t see it, you need to download Samsung Kies and install it. Un-plug and plug in the micro-USB cable to your Galaxy Note and you should now get the yellow highlight.
Step 7. Choose “PDA” in ODIN and choose “attstockrom.tar”.
Step 8. Choose “Start” and relax as your AT&T Galaxy Note is being unrooted back to stock Android 2.3.6.
Step 9. After about 5 minutes of flashing, your Galaxy Note will reboot.
Step 10. Once it reboots, you will want to do a factory reset also to wipe all your user settings, apps, and etc. Hold down Volume Up and Power button together until your phone resets.
Step 11. When your phone resets, keep holding down Volume Up and let go of the Power button.
Step 12. Choose “wipe data/factory reset” in stock recovery.
Step 13. Choose “Yes”.
Step 14. Reboot your phone and you should find a completely stock Android 2.3.6 on your AT&T Galaxy Note.
For Canadian Rogers/Bell/Telus, the steps are identical but you need to find the stock ROM tar file for your carrier.
Also, this unroot method doesn’t wipe your personal media files such as your photos and videos on your SD card or internal storage. If you are returning your phone to AT&T for warranty, make sure to move them to your hard disk and erase them.
For Mac and Linux users, you can use open-source Heimdall tool instead of ODIN and also you don’t need drivers.Need Help? Follow/add me on Google+, Facebook, or Twitter!
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You will need a rooted Galaxy Note to install all ROM/kernels.
NOTE: If you are a noob, please remember the author of this site is not responsible if you mess up your phone. Make sure you know what you are doing before following any instructions on this site!
First time to rooting and custom ROMs? Please see our Galaxy Note Root Guide FIRST!