A solves all of this. It is pre-scanned, pre-named according to the No-Intro or Redump standards, and often pre-configured to work with specific RetroArch cores (like Snes9x , Mupen64Plus , or PCSX ReARMed ).
: Don't forget that systems like PS1, Sega CD, and Dreamcast require BIOS files to run. You can find comprehensive packs like Abdess/retrobios to ensure everything boots correctly. Pro Tips for Android Setup RetroArch on Android Finally Made Simple (2025 Guide) pack roms para retroarch android better