The palm-sized vertical handheld device “Miyoo Mini Plus”, featuring a Game Boy retro design and outstanding portability, has become a massive hit among retro gaming fans worldwide.
Immediately replacing the unbranded stock MicroSD card with a reliable brand like SanDisk and installing Onion OS will transform your Miyoo Mini Plus into an outstanding retro handheld. Note that Onion is not a custom firmware (CFW): the official FAQ (“Why Onion is not a CFW”) states that it lives on the SD card and does not rewrite the device firmware. Remove the card and the console boots the stock system again.
[Preparation] Critical MicroSD Card Steps Right After Buying Miyoo Mini Plus
Stock Unbranded MicroSD Cards Have High Failure Rates! Replace with a Reliable Brand
The black unbranded MicroSD card bundled in the package has extremely low durability. Replace it immediately with a trusted brand like SanDisk or KIOXIA (64GB to 128GB).
| MicroSD Card Type | Durability & Quality | Save File Safety | Recommendation |
|---|---|---|---|
| Bundled Unbranded SD Card | × Extremely Low | ★☆☆☆☆ (High Risk) | Initial Power Check Only |
| SanDisk / KIOXIA MicroSD | ◎ Extremely High | ★★★★★ (Very Safe) | Daily Use & Permanent Save Storage |
FAT32 Formatting Requirements
Format the card as FAT32. Two points are worth knowing. First, the 32 GB ceiling you see in Windows is a limitation of the Windows formatting dialog, not of the FAT32 file system itself. Second, the official Onion installation guide advises against third-party tools such as GUIFormat / fat32format, because cards larger than 128 GB formatted this way have produced frequent file-system errors; it points to Rufus instead (Large FAT32, 32 KB cluster size). Verified against the official documentation on 2026-08-18.
- Download Onion OS: download the release archive from the official GitHub repository and extract every file to the root of your FAT32 MicroSD card.
- Install on the console: insert the card into the Miyoo Mini Plus and power it on. Leave it alone until the progress bar completes.
- Interface language: set the language from the Settings tab. The “Apps → Language” path quoted by older guides does not appear in the current Onion documentation, so follow the Settings tab on the firmware you actually have.
- Download Onion OS: Download the release zip from official GitHub and extract all files onto your FAT32 MicroSD root.
- Install on Console: Insert SD card into Miyoo Mini Plus and power on. Wait until progress completes.
- Language Setup: Navigate to [Apps] ➔ [Language] to select your language.
Essential Onion OS Shortcuts for Gameplay Comfort
- [Menu] (short press): open the Game Switcher
- [Menu] + [Select]: open the RetroArch quick menu
- [Menu] + [Start]: cycle the aspect ratio
- [Menu] + [R2]: save state
- [Menu] + [L2]: load state
- [Menu] + [R]: fast-forward
- [Menu] + [L]: rewind
- [Menu] + [Volume +/-]: screen brightness (Mini Plus only)
These are the Onion OS defaults as documented officially and re-checked on 2026-08-18; they can be remapped, so confirm them against the manual for the version you are running.
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