Download the root file kernel For root the Galaxy A3 2016 SM-A310F
Model Number : SM-A310F
Android Version :Nougat (7.0)
Extract the kernel placed in this post after download and Flash the file in the pda section in the odin software.
This file is only for Galaxy A3 SM-A310F model, dont use this file for other models .if use it can damaged your device