These are the instructions to root Samsung Galaxy Note 3 SM-N900A (AT&T) using Odin on Windows Computer.
Requirements: Your Samsung Galaxy Note 3 SM-N900A should have at least 30-40 percent battery to perform the rooting process.
Step 5: After switching-off the phone, you need to boot into Download Mode. To boot into download mode Press and hold Volume Down Key, Home Button and Power key at same time for 5-8 seconds until download mode is active.
Step 14: In the Download mode you will be able to see a Warning Yellow Triangle Sign. In this situation you have to press the Volume up key to enter Odin Download mode.
Step 15: Now, run Odin3.exe (You have extracted this in Step#2) on your computer. Then connect your phone to the computer.
Step 16: Once you have connected the phone to the computer, Odin will automatically recognize the device and show “Added” message at the lower-left panel.
Step 17: Once your device detected by Odin, click on the “PDA” button and select the Root_de_la_Vega.tar file that you have extracted in Step #2.
Step 18: Now, click on the “Start” button in Odin to begin the Flashing process.
Step 19: Once flashing process is completed your smartphone will restart automatically and you will be able to see Green Pass message in Odin. Then disconnect your Smartphone from the computer.
Step 24: Now your Samsung Galaxy Note 3 SM-N900A is Rooted. To check whether your phone is rooted correctly, open Applications Menu, there you will be able to see a new app installed, called SuperSU. If this app exist then it means you have successfully rooted your device.
[*] Data loss process: Your Phone Data like contacts, pictures, videos, music and etc will be deleted it you follow the above tutorial. So, make sure to take backup of your important data before following the rooting process.
[*] Warranty Void: Your Samsung Galaxy Note 3 SM-N900A Warranty may be Void after following the above tutorial.
[*] Once rooting process is completed you can insert back your MicroSD card.
[*] If you want to root Samsung Galaxy Note 3 N900 then see root note 3 n900.
[*] Samsung Stock Firmware: If you are looking for the original firmware for your device, then head over to Download Samsung Stock Firmware page.
[*] Samsung USB Driver: If you are looking for the original USB Driver for your device, then head over to Download Samsung USB Driver page.
[*] Credits: Thanks to designgears (xda developer) for providing the root files for Note 3 N900A. Without the root file, the above tutorial was not possible.