1.) Make sure you have ODIN 3.10 setup (there are many tutorials on xda and youtube for this).
2.) Download the latest firmware zip from below.
3.) Extract the tar.md5 file from the zip.
4.) Add the tar.md5 file to the AP section of ODIN.
5.) Under Options make sure to ONLY select "Auto Reboot" and "F. Reset Time". DO NOT select repartition (or really anything else)!!!
6.) Click start and let it flash.
(Again there are plenty of tutorials on how to use ODIN)
This won't wipe your data (probably). (It didn't during my test but always make backups just in case.)
G925TUVU1AOCG SHA256 (of zip): 70146cbcf5fe157ca1691085db15e8ffaa7cbdeaa16a604356 7a1c5796a6cb93
Flashing anything is dangerous and I am not responsible for anything you do to any of your devices!