This tutorial can be used for both upgrading and downgrading a system. And also for re-flashing the current system. To do this, you need a ROM file suitable and provided by Samsung, and the program called Odin. Links to get a suitable ROM file and Odin:
ROM file for your device:
https://goo.gl/yqj5Qy
Odin Download Link:
https://goo.gl/nJHF34
After downloading ROM file and Odin, we’re putting our phone or tablet to download mode. Make sure that your battery level is higher than 50 percent before the installation. You’ll have an easy time of it if you carry out as it is told in the video tutorial. You had better restore factory reset after the first start to clean remaining junk files from the previous system. The aim of this video is just to guide you. And remember, everything you perform will be your own responsibility.
Tutorial Video: https://uysalmetin.blogspot.com.tr/2017/11/how-to-install-firmware-to-your-samsung.html?m=1