ok, all this is on windows
first note this can brick your device meaning it stops working completly
You always have this risk when rooting
Then download odin from here
And CF Auto Root here
Extract Odin and right click it and choose Run as administrator
Power off your phone. Wait 5-6 seconds for vibration to confirm complete switch off. Now, put thephone in Download Mode by pressing and holding down the Home & Volume Down button together while pressing the Power button. You will soon see a warning screen; press Volume Up button to enter Download Mode.
When all done, connect your device to your PC using USB cable. You will see an “Added!!” massage in Odin’s message box. Try other USB port, preferably USB port located in back in your desktop PC if you don’t see the Added message
Click the AP Button, and select that CF-Auto-Root-trltevzw-trltevzw-smn910v.tar.md5 file that you got from my link before
In the Odin window, make sure only Auto Reboot and F. Reset Time checkboxes are selected (default set up).then click start button to begin the flashing process.
Once flashing completed, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from computer.
Then it is rooted and you can run Dr Fine to try to recover the files