Dumb question, but I was told that to update a .CIA (wanted to update RetroArch), I just install the newer version and it would overwrite the older one. I need the newest version of FBI for setting up the MSET exploit for RxTools. Can I update FBI.cia using the .CIA, or do I need to download and use the .3DSX version? Basically, can I update using the exact same copy of FBI that I want to update, or do I need a separate copy?
Yes, you can ... just use FBI to install the new FBI.cia file ... over the existing installtion ... works without any problem
I am new to homebrew and stuff but I always wondered what is CIA?
CIA is basically a file format that contains a complete software installation. Think of it like a ZIP archive ... when you install the CIA file it will just be unpacked and installed on your system.