When you download the OS files for flashing via the Odin Tool , they usually come in a compressed package (.zip or .rar) that extracts into several specific files:
: Used for re-partitioning the internal storage (rarely needed unless the device is bricked). Technical Specifications What Is Os File For Samsung Galaxy Gts5360
: Contains the modem and baseband firmware for cellular connectivity. When you download the OS files for flashing
: The main system file containing the OS build and core applications (e.g., S5360XXMK1 ). What Is Os File For Samsung Galaxy Gts5360