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 Grand Prime Stock Rom*Search for your model and find rom for your regionSamsung Usb DriversOdin flash toolFlashing Samsung Grand Prime Stock rom :- You must download all necessary file.(Samsung USB driver or Smart Switch and Odin)
 - Then you must install all driver or samsung smart switch to your computer or PC.
 - Extraxt Odin V3.10.6. file on the destination folder.
 - Download Stock rom file
 - Switch Off your Samsung Grand Prime to start flashing process.
 - Then, you must run Odin3 v3.10.6 by right click on Odin.exe and select Run as Administrator.
 - When program is running, now you can click AP, and navigate to the *.tar or *.tar.md5 firmware file.
 - Now your firmware file has been inserted in Odin3
 - Then, Enter download mode your Samsung Grand Prime by pressing and hold Volume Down Button + Home Button + Power Button. Hold and press all button untill your phone vibrate and LCD show menu.
 - Connect your S6 to pc or laptop
 - Start downloading and wait until it's says it's done