For those of you who need to unroot your Galaxy Note 4, perhaps because you need to return your phone for warranty, need to get out of a nasty bootloop, or simply tired of using custom ROMs and want to run stock, you can do so easily by re-installing the stock firmware.
Now, unrooting with stock firmware does not erase anything if you are coming from stock ROM or firmware, it will simply update you to the latest stock firmware you flash. However, if coming from custom ROM, you may need to do a factory reset. Doing a factory reset in stock recovery (after unrooting) WILL ERASE EVERYTHING on your phone. You may have to do that so if you are coming from custom ROM, BACKUP EVERYTHING on your phone before following the guide.
Step 1. Check the model number of your Note 4 in Settings->About device. Min says “SM-N910F” so I will need a stock firmware with model number SM-N910F.
Step 2. Power off your Note 4 then hold down Volume Up, Center Home, and Power buttons together for about 5 seconds until you see a warning screen like shown below:
Step 3. Hit Volume Up button to enter Download Mode and connect a micro-USB cable from your Note 4 to your computer.
Step 4. Go to our Galaxy Note 4 Stock Firmware page and download the appropriate stock firmware for your Note 4 model.
Step 5. Unzip the stock firmware you downloaded and you should get the actual stock firmware file ending in “tar.md5”.
Step 6. Also download ODIN v3.09 program and unzip. For Mac or Linux, use JODIN instead.
Step 7. Next double-click on Odin3 v3.09.exe to run the ODIN program.
Step 8. Make sure you see a blue-highlighted box with a random COM number. If you don’t see it, download and install Galaxy Note 4 Windows drivers below and re-connect your micro-USB cable to your Note 4.
Then hit the “AP” button and browse and select the stock firmware file you unzipped earlier.
Step 9. Hit “Start” button to start.
When done, you should see “RESET!”. The process should take around 5 minutes at most.
Your phone will reboot about two times and when booted, you should be back fully on stock firmware.
Now, if you get stuck on bootloop, you can do a factory reset in stock recovery as shown in my video tutorial. That will erase EVERYTHING on your Note 4, if you don’t want that, you can also follow Note 4 Root guide, which will re-install CWM or TWRP recovery, then do a factory reset with CWM or TWRP, which will only erase your Apps, App Settings but not personal files on your storage.