A flash file is the official operating system (Android OS) package designed by Samsung specifically for the SM-N920F. It contains the system image, kernel, recovery mode, and modem firmware. Flashing this file restores the phone to its original factory state.
You can find the Samsung N920F flash file on: samsung n920f flash file
and select the file starting with "CSC" (to wipe data) or "HOME_CSC" (to keep data). Start Flash: A flash file is the official operating system
Install the Samsung USB Driver for Mobile Phones on your PC so Odin can recognize your device. samsung n920f flash file