RetroCompass
RetroCompass

Miyoo Mini Plus — Custom firmware

Quick answer

Steps

  1. 1Stock (Linux): the default Miyoo OS — keep it only if you want the out-of-box menu.
  2. 2Onion OS: the flagship CFW for the Mini Plus — richest features, RetroArch, themes, box art, Wi-Fi tools.
  3. 3MinUI: a minimalist launcher — fast and clean, copy /bios, /miyoo354, /roms, /saves and MinUI.zip (do not unzip) to the card.
  4. 4Pick one CFW per SD card; back up saves before switching firmware.
Last verified: 2026-06-20Source: github.com

The Miyoo Mini Plus runs a Linux-based stock OS, but its reputation comes from community firmware. Onion OS is the de-facto choice: a polished RetroArch front-end with themes, box art, Wi-Fi net play and an OTA updater. MinUI is the leading minimalist alternative — almost no menus, very fast, and it shares one card across many handhelds. spruceOS and Allium are newer options. CFW lives entirely on the microSD, so you can swap firmware by reflashing the card; nothing overwrites the stock system permanently.

FAQ

Onion OS or MinUI — which should I choose?
Onion OS if you want box art, themes, RetroArch options and Wi-Fi features; MinUI if you want a stripped-down, fast launcher with almost no configuration. Both are free and install to the microSD.
Does installing custom firmware void anything or brick the device?
No. The Mini Plus boots from the microSD, so CFW lives on the card. If something goes wrong you reformat the card and reinstall — the device itself is hard to brick this way.
Can I keep stock and Onion OS at the same time?
Not on one card — each SD card holds one firmware. Use a second card (or reflash) to switch between stock, Onion OS and MinUI.

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