Step 2. Hit Volume Up button to enter ODIN Download Mode then connect a micro-USB cable from your Note 4 to your computer.
Step 3. Go to ChainFire’s XDA thread here and download the appropriate CF Auto root for your Note 4 model.
Step 4. Unzip the downloaded file and you should see a bunch of files. Double-click on ODIN3-v3.07.exe to run ODIN program.
Step 5. Next, you should see a blue, highlighted box with a random COM number. If you see this, you have proper Note 4 Windows drivers installed. If not, download and install Note 4 Windows drivers.
Step 6. Choose “PDA” then select the file ending in “tar.md5”.
Step 7. Hit the “Start” button and CF Auto Root should be flashing to your Note 4.
Step 8. When done successfully, you should see “RESET!”. If you get stuck, try using a different USB hub/cable and simply try again.
Step 9. Reboot and you should find a new app called “SuperSU” in your app drawer. Congratulations! You’ve successfully rooted your Galaxy Note 4!
Step 10. Open up SuperSU app and update the binary if needed.