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For those of you who have bricked your Galaxy Note 2 (perhaps ended up in a bootloop), want to return to stock firmware (because you forgot to make a backup ROM!), or you want to return your Note 2 back to Samsung Service center for warranty, here’s how to unroot/unbrick your Galaxy Note 2 with stock firmware.
Also, you can use this method to update your stock ROM to the latest stock firmware. For example, if Android 4.2 comes out, you can use this method to update instead of Kies if you want.
First, if you are rooted, I HIGHLY ADVISE you to make a backup ROM (see How to Make Backup ROM). And after making backup ROM, do MAKE A BACKUP of your internal storage by copying everything to your hard disk. If something goes wrong, you will be able to do a factory reset in stock Android recovery and get all of your settings, apps, photos, and videos back.
Also, if you are on a ROM like CM10, AOKP, or any ROM that’s non-Samsung, non-TouchWiz, you will definitely need to do a factory reset. You can also do a factory reset in CWM Recovery BEFORE unrooting, that will not erase the contents of your internal storage (then you can skip the backups).
If you are returning your phone for warranty, run Triangle Away app before unrooting, that will erases any traces of root. (Also installing a stock firmware DOES NOT increase binary count.)
This method is using ODIN and Windows computer. If you have Linux or Mac computer, you can also use Mobile ODIN PRO (on Play Store) to do the same thing.
So, let’s unroot/unbrick your Galaxy Note 2.
Step 1. Turn your Note 2 off, then hold down Volume Down, Center Home, and Power buttons together to enter ODIN Download mode warning screen.
Step 2. Hit Volume Up to enter Download mode and connect a micro USB cable from your Note 2 to your computer.
Step 3. Go to either Samsung-updates.com or SamFirmware.com and download a compatible stock firmware for your Galaxy Note 2. For example, if you have the international Galaxy Note 2, search for model GT-N7100 and download the appropriate firmware for your country. If your country firmware does not exist you can use one that’s close to it, these firmwares will work on all GT-N7100.
By the time you read this tutorial and there’s T-Mobile Galaxy Note 2, you can also search for T-Mobile Galaxy Note 2 firmware model number instead of GT-N7100 and same for all other carriers like Sprint, AT&T, and Verizon.
Step 4. Unzip/extract the stock firmware zip file, you will find a file ending in “tar.md5”, that’s the stock firmware file. (Don’t have unzipping program? Download and install 7Zip first.)
Step 6. DO NOT TOUCH ANYTHING ELSE but click on “PDA” and point to the “tar.md5” stock firmware you downloaded/extracted earlier.
Step 7. Hit “Start” to begin the unrooting process. This should take around 5-10 minutes. If it stalls for some reason, you can always re-start your Note 2 into ODIN Download mode and try again. Also, if it stalls in the beginning, try another USB hub, that usually fixes those. Also, if you get “Kies Firmware error”, you can re-try it too, that’s same as ODIN Download mode, no need to panic.
Step 8. When it’s done successfully, you will get “PASS!”.
Step 9. If your phone boots into stock firmware, you are all good to go. If it doesn’t boot up after 10 minutes OR you get a lot of force closes, you can do a factory reset in stock recovery. But STOP HERE OTHERWISE.
Step 10. To do a factory reset, turn off your phone. Then hold down Volume Up, Center Home, and Power buttons together. When you see the Note 2 logo, keep holding down Volume Up and Center Home button but let go of the Power button.
Step 11. Choose “wipe data/factory reset”. DOING THIS WILL ERASE EVERYTHING ON YOUR INTERNAL STORAGE!
After that your Note 2 should reboot just like the day you got the phone with everything erased.