How to install ٍStock rom for Samsung Galaxy S6

Why you need to install ٍStock rom :

Some time you need to fix some thing with your device , Like Rooting your device , when you install custom rom or custom recovery , And it cause a harm to your device , Or you want to downgrade from a higher version of your system to Stock one ,

Downloads  :

Samsung Galaxy J5 Stock Roms  

Samsung Usb Drivers
Odin flash tool

Flashing Samsung Galaxy S6 Stock rom :

1. You must download all necessary file.(Samsung USB driver or Smart Switch and Odin)
2. Then you must install all driver or samsung smart switch to your computer or PC.
3. Extraxt Odin V3.10.6. file on the destination folder.
4. Download Stock rom file
5. Switch Off your Samsung Galaxy S6 to start flashing process.
6. Then, you must run Odin3 v3.10.6 by right click on Odin.exe and select Run as Administrator.
7. When program is running, now you can click AP, and navigate to the *.tar or *.tar.md5 firmware file.
8. Now your firmware file has been inserted in Odin3
9. Then, Enter download mode your Samsung Galaxy S6 by pressing and hold Volume Down Button + Home Button + Power Button. Hold and press all button untill your phone vibrate and LCD show menu.
10. Connect your S6 to pc or laptop
11. Start downloading and wait until it's says it's done

Source : Rooter15. XDA