RetroCompass
RetroCompass

Miyoo Mini — Reset

Quick answer

Button combo

Back up savesreformat SD(FAT32)reinstall Onion OS

Steps

  1. 1Back up first: copy the Saves and RetroArch/saves folders (and BIOS) off the microSD to your computer.
  2. 2For a config-only reset, delete Onion's config/state files or use Onion Desktop Tools' configuration manager, then reboot.
  3. 3For a full reset, reformat the microSD as FAT32 (MBR) to wipe everything.
  4. 4Reinstall: copy a fresh Onion-v4.x.x.zip (the 7 folders) to the card root and let the installer run on boot.
  5. 5Restore your backed-up Saves and BIOS folders, then press SELECT on the Games tab to refresh ROMs.
Last verified: 2026-06-20Source: onionui.github.io

Because everything on the Mini lives on the microSD, a reset means working on the card, not the device. For a soft reset, clear Onion's config (or use Onion Desktop Tools) to return settings to default while keeping ROMs. For a clean slate, reformat the card to FAT32 and reinstall Onion OS from a fresh download — the on-device installer rebuilds the system on first boot. Always copy your Saves and RetroArch/saves folders off the card first, as reformatting erases them permanently. The original Mini has no internal storage to factory-reset, so the card is the whole system.

FAQ

How do I reset the Mini to a clean state?
Reformat the microSD as FAT32 (MBR) and reinstall Onion OS from a fresh Onion-v4.x.x.zip. The device has no internal storage to wipe — the reset happens entirely on the card.
Will a reset delete my game saves?
A full reformat erases everything on the card, including saves. Back up the Saves and RetroArch/saves folders (and BIOS) to your computer first, then restore them after reinstalling.
Can I reset settings without losing my games?
Yes. Delete or reset Onion's config files (or use Onion Desktop Tools' configuration manager) to restore defaults while keeping your ROMs and saves on the card.

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