On the stock SD card, you can find the BIOS files under RetroArch >. You can simply copy/paste the files from your stock SD card, or add your own. In the BIOS folder, add your BIOS file collection. Once you have run the Onion Installer, you can now shut down the device, eject the microSD card, and add your files to it. To update from a previous release of Onion, check out the Onion upgrade instructions from their wiki page.Ĭredit for Onion goes to their wonderful ragtag team of community contributors. Start up the device and it will run the installer. Eject the SD card and place it in your Miyoo Mini.Unzip the file, and place all of the contents into your SD card.Head over to the Onion GitHub Releases page and grab the latest release (it will be a zip file).If you have a Mac, “Erase” the disk using the Mac’s built-in Disk Utility app, with the format MS-DOS (FAT), name it whatever you want. If using Windows, use the guiformat tool to format the card to FAT32.Format your microSD card to FAT32 file system.If you run into any issues, be sure to check out Onion’s comprehensive wiki page. For a full list of features, stop by their Features page. Here are the installation instructions for Onion. From there, plug a 5W USB-A to USB-C cable into the device while it is off, and it will power on and update. The video below will walk you through the process, but it’s as simple as downloading this firmware file and placing it in the root directory of your microSD card. The Miyoo Mini Plus will need to be updated to the 20230326XXXX (or later) firmware to take advantage of new developments for OnionOS. Update to the March 2023 firmware (Miyoo Mini Plus) If you are having issues upgrading your device, or it gets caught in a loading screen while flashing the new firmware, follow the instructions provided in this Reddit comment. Their process is a bit different, in that they move the “TF card” files to the SD card after the upgrade either method works fine. Here is a fancy infographic (credit: PIXELSHIFT and TNGLIKER) that walks you through the process. Plug the SD card into your computer and delete the miyoo283_fw.img file before doing anything else.Unplug the device from the cable and remove the SD card. The device will restart and will then display a battery image and the charging screen. The Miyoo Mini will automatically power on and run the update.For best results, use a USB-A to USB-C cable, and a “smart” plug that can adjust wattage, or one of those cheap 5V/1A plugs that used to come with cell phones. Plug the Mini into a wall charger, and be sure to use use a low-wattage wall plug.Eject the SD card from your computer and plug it into the Miyoo Mini.Go to “TF card” folder and drag the three subfolders (Emu, miyoo, and RetroArch) into the root of your card, and replace any existing files when prompted (this part is optional).In the unzipped folder, go to “The firmware” > miyoo283_fw.img and drag that file into the root of your Miyoo Mini SD card.Go to the Miyoo website and download the latest image update, then unzip the file.Save any important game files or your BIOS folder to your computer just in case.it starts with 202201… instead) then follow the firmware update instructions below. To check your firmware version, go to Setting > Device Info and verify the the “Version Number” is 202204190828 or “20221216XXXX” - if so, you are good to go to the next section. In order to use the most recent versions of OnionOS, you must first update the Miyoo Mini base firmware to the April 2022 (or later) version. Update to the April 2022 firmware (Miyoo Mini) Hardshell case (use coupon RETROGAMECORPS10) The original Miyoo Mini is approximately the same size as a deck of playing cards, so playing card cases are great alternative carriers for this device. There are plenty of choices when it comes to custom buttons and stickers, 3D-printed grips, and more. One of the great things about a popular device like the Miyoo Mini is that the community comes together to find all sorts of accessories and solutions to every little need.
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