Odin3 is designed to flash Samsung smartphones with stock firmware packages. Custom ROMs rarely do flash with Odin, as this program does not recognize .zip extensions, but only .tar files. Before installing a new firmware, the device has to be rooted and a custom recovery has to be installed.
This application has it sorted out, and roots the Samsung Android device so that some custom firmware packages get to be installed to the smartphone. Users should check the developer’s guides to every model available, as the installing procedure varies from one phone to the other.
It is also recommendable to double check the ROM.tar version in the application’s forum.