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OK so what program to use to decompress the backup file made by Multitool, then edit the armbian firmware and compress it again?

Hey! I'm very new to this topic, do you mind helping? I installed your Multitool on an SD card, got the TV box backup, but now I have a 5 GB backup.gz file, and when I open it, theres a file without extention there. What programs would you advise to use (i'm on Windows 10) to extract the firmware from it and then put it back to this format later? If I understand it correctly, I need to decompress it with some program, edit, then compress it back with something and then flash to the TB box? Maybe there's some noob friendly guide out there that I didn't find, or you can explain the details yourself? My goal is to get the firmware, then edit it - translate to another language, add some games, etc, then flash it back to the TV box. Thank you!