If you are using a custom retro case (like an Nespi 4 case), make sure to install the appropriate safe-shutdown scripts via the terminal. Powering down the Pi by pulling the plug can corrupt your 256GB image data.
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Disclaimer: Ensure you are abiding by local laws regarding ROM usage. This guide assumes you have the legal right to use the included ROMs. Step 1: Download the Image If you are using a custom retro case