Odin is useless without the corresponding device firmware. A common pain point for technicians is downloading the flashing utility from one site and searching blindly across the web for matching BL (Bootloader), AP (Application Processor), CP (Core Processor/Modem), and CSC (Consumer Software Customization) files.
Think of Odin as the tool that performs the actual flashing. Without Odin or an alternative tool, you simply cannot flash a new Samsung firmware onto your device (unless you're using something like Heimdall). gsmromnet odin better