FSW development is done by a different team than mine but I believe it's just managed through gitlab. Releases are done through tags, and any updates that need to be made have tickets created for them and are developed by the FSW team. Final approval is given by certified product engineers and then a new tag is created for that release. Like I said this is a different team but from what I've seen the process is fairly modern given how old our hardware is. I'm not sure of the exact process of how it's loaded onto the satellite through.