Unlock the Full Potential of Your Miyoo Mini Plus with Onion OS: A Comprehensive Guide

The Miyoo Mini Plus is an outstanding device for retro gaming, but you can take it to the next level by installing Onion OS. This custom firmware, developed by the community, enhances the overall performance, user interface, and gaming experience, making it the go-to choice for Miyoo Mini Plus users. In this comprehensive guide, we’ll walk you through the steps to install and optimize Onion OS on your Miyoo Mini Plus, unlocking its full potential.

Why Choose Onion OS for the Miyoo Mini Plus?

Onion OS is widely regarded as the best custom operating system for the Miyoo Mini Plus due to several key benefits:

• Expanded Emulation Support: Supports 48 pre-configured emulation systems, including apps in Expert Mode.
• Optimized Performance: Upgraded emulation cores ensure smoother gameplay.
• User-Friendly Interface: Streamlined menus with improved navigation, making it more intuitive.
• Advanced Features: Real-time clock emulation, cartridge function, and rumble motor support enhance the experience.

Preparing for Miyoo Mini Plus Onion OS Installation

Before starting the installation process, ensure you have the following:

• High-Quality SD Card: 128GB or higher recommended.
• Reliable SD Card Reader: Avoid using the stock reader that comes with the device.
• ROM and BIOS Files: Required to run emulators properly.

Step 1: Checking Your Miyoo Mini Plus Firmware Version

1. Power on your Miyoo Mini Plus.
2. Navigate to Settings > About.
3. Verify the firmware version. If it is not the latest (20230326-2339), you will need to update it first.

Step 2: Updating Miyoo Mini Plus Firmware

1. Download the latest firmware from the official Miyoo website.
2. Extract the downloaded file.
3. Copy the miyoo283_fw.img file to the root directory of your SD card.
4. Insert the SD card into your Miyoo Mini Plus.
5. Connect the device to a wall charger (USB-A to USB-C). Do not use a PC.
6. The device will automatically start the update process. Do not disconnect the charger until the update is complete.
7. Once done, remove the SD card and delete the miyoo283_fw.img file, then reinsert it into the device.

Step 3: Installing Onion OS on the Miyoo Mini Plus

Formatting Your SD Card

1. Connect your SD card to your computer using a card reader.
2. Format the SD card to FAT32 using a tool like Rufus:
   • Open Rufus.
   • Set Boot Selection to Non-bootable.
   • Set the File System to FAT32.
   • Click Start and confirm any warnings.

Installing Onion OS

1. Download the latest Onion OS release from the Onion GitHub Releases page.
2. Extract the zip file. You should see a folder named App.
3. Copy the App folder to the root directory of your formatted SD card.
4. Eject the SD card, insert it into your Miyoo Mini Plus, and power on the device.
5. Navigate to Apps > The Onion Installer and run the installer. The installation takes about 10-15 minutes.

Step 4: Adding BIOS and Game Files

Adding BIOS Files

1. Power off the device and remove the SD card.
2. Connect it to your computer and locate the BIOS folder on the SD card.
3. Copy the necessary BIOS files, ensuring they are named correctly and placed in their respective directories.

Adding Game ROMs

1. Copy your game ROMs into the Roms folder on the SD card.
2. Organize them into subfolders (e.g., NES, SNES, GBA) for easy access.

Step 5: Customizing Your Miyoo Mini Plus with Onion OS

Adding Themes

1. Download themes from the Onion theme repository.
2. Extract the theme files and copy them into the Themes folder on your SD card.
3. Change themes by going to Settings > Themes on your Miyoo Mini Plus.

Emulator Settings

• Customize emulator settings via RetroArch for optimal performance.
• Enable RetroAchievements by entering your credentials in RetroArch > Settings > Achievements.
• Save your configuration under Configuration File > Save Current Configuration.