: Ensure you have the "1636 - Pokemon - Fire Red (U)(Squirrels)" file (usually a Get a Patcher : Use a tool like Rom Patcher JS (web-based) or Marc Robledo's Patcher Apply the Hack

are designed to recognize this specific file structure to ensure your patching process takes less than a minute. How to Use It Identify the File : Look for a file named something like 1636 - Pokemon Fire Red (U)(Squirrels).gba Verify the Patch

Use a tool like (Windows) or MultiPatch (Mac):

: Nearly every "UPS" or "BPS" patch file found on sites like PokeCommunity ROMhacking.net