You need to downgrade 4.3 to 4.1.2
1. you must obtain root you can use chainfire and then install new superuser to have super user and disable knox via terminal with
su (enter)
pm disable com.sec.knox.seandroid
2. you will need mobile odin pro. (google it)
3. Install The Mobile Odin And Give it root access
4- Open Mobile Odin > Choose File > Choose your Firmware file > Start Flashing ROM
5- After The Instillation Complete your device will freeze on Samsung Logo .. Go to recovery mod and wipe the cache and factory reset
YOU NEED to find the firmware yourself this is assuming you know what you're doing. I can confirm this works with i317 4.3
credit goes to usofttech. You can also google his tutorial he has download links -cricketmafia4