Ensure the save file matches your game region (NTSC or PAL) to avoid corruption issues. How to Use the Save File on Dolphin Emulator (PC/Android) Using a 100% save file on Dolphin is the easiest method.
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Use the homebrew tool to "restore" that file from your SD card directly onto your physical Memory Card. 2. The Emulator Way: Dolphin need for speed hot pursuit 2 gamecube save file