It seems you're asking about a combination of terms related to Samsung firmware flashing: gsmromnet (a website), Odin (the flashing tool), and full (likely meaning a complete firmware package).
A full firmware set usually includes four primary binaries that you must load into the Odin Flash Tool BL (Bootloader): Contains the bootloader files (prefix AP (System/Android Processor): The core system partition and largest file (prefix CP (Core Processor): Contains the modem/radio firmware (prefix CSC (Consumer Software Customization): Contains region-specific and carrier branding data (prefix Critical Installation Steps Preparation : Ensure you have the Samsung USB Drivers gsmromnet odin full
While the keyword "gsmromnet odin full" is popular, you should know the alternatives: It seems you're asking about a combination of
Wait for the progress bar to finish. Once complete, you will see a green PASS! message. [ ] Backed up personal data
Finish and first boot