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when you try to open the rar or use the file? Are you using the stock SD card that came with the device?
Here is how to address this issue based on common troubleshooting steps for that device:
Use 7-Zip (Windows) or The Unarchiver (Mac) to extract the .rar file. Do not use built-in Windows extractors, as they often fail with complex nested rar files.
For the best experience, many users recommend installing OnionOS , which often handles ROM and firmware management much better than the stock software. To help you specifically, could you tell me:
Ensure the extracted files (usually .zip , .sfc , .bin ) are placed in the correct ROMs folder on the SD card ( /Roms/[SystemName]/ ) and that you have BIOS files installed for systems like PS1.
If the device won't boot, you may need to reflash the official Miyoo firmware to fix the "wrong" file.