1. Start Kies, They can be find HERE
2.Click Tools-> Firmware upgrade and initilazation
3.Type in model of your phone for example AT&T is : SGH-I337 ( all in capital letters) click OK.
4.Then type serial number off the stcker under battery also in capital letters click OK
5.There will be info about firmware click OK
6.Info about software version. Put your phone in download mode then connect to PC using orginal USB cable, click OK
7. Follow info on screen.
8. Phone will reboot by itself when all is done correctly.
To try this you need to be able to put phone in download mode. I just restore my S4 to factory settings using this metod. Let me know..
Good luck all.