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muOS

muOS (MustardOS) is a custom firmware for several Anbernic and TrimUI handhelds. It aims to be configurable, themeable, and easy to use, and it ships with a wide selection of emulator cores covering 70+ systems.

BIOS

Because muOS uses RetroArch under the hood, the instructions are generally the same as RetroArch. By default, the muOS BIOS directory is /MUOS/bios/:

Replace the E:\ drive letter with wherever your SD card is:

igir copy extract test clean ^
  --dat "https://raw.githubusercontent.com/libretro/libretro-database/master/dat/System.dat" ^
  --input BIOS ^
  --output E:\MUOS\bios

Replace the /Volumes/muOS drive name with whatever your SD card is named:

igir copy extract test clean \
  --dat "https://raw.githubusercontent.com/libretro/libretro-database/master/dat/System.dat" \
  --input BIOS \
  --output /Volumes/muOS/MUOS/bios

Replace the /media/muOS path with wherever your SD card is mounted:

igir copy extract test clean \
  --dat "https://raw.githubusercontent.com/libretro/libretro-database/master/dat/System.dat" \
  --input BIOS \
  --output /media/muOS/MUOS/bios

ROMs

For ROMs, muOS "does not enforce strict naming conventions, allowing you to name and structure your folders however you prefer, including nested folders for organization." Because of that flexibility, Igir does not provide a muOS-specific output token.

You can still let Igir organize ROMs by system using the DAT name with the --dir-dat-name option:

Replace the E:\ drive letter with wherever your SD card is:

igir copy extract test clean ^
  --dat "No-Intro*.zip" ^
  --input ROMs ^
  --output E:\ROMS ^
  --dir-dat-name ^
  --dir-letter ^
  --no-bios

Replace the /Volumes/muOS drive name with whatever your SD card is named:

igir copy extract test clean \
  --dat "No-Intro*.zip" \
  --input ROMs \
  --output /Volumes/muOS/ROMS \
  --dir-dat-name \
  --dir-letter \
  --no-bios

Replace the /media/muOS path with wherever your SD card is mounted:

igir copy extract test clean \
  --dat "No-Intro*.zip" \
  --input ROMs \
  --output /media/muOS/ROMS \
  --dir-dat-name \
  --dir-letter \
  --no-bios