RetroCompass
RetroCompass

Miyoo Mini V4 — 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

Like the original Mini, everything on the V4 lives on the microSD, so 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. If the V4's screen looks wrong after a reset, confirm the base firmware is 202310271401 or later for 752x560.

FAQ

How do I reset the V4 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.
After resetting, the V4 screen looks wrong — what do I check?
Make sure you reinstalled a current Onion release and that the base firmware is 202310271401 or later, which is what enables the V4's native 752x560 resolution. Updating the stock firmware from Miyoo usually fixes resolution issues.

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