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It very much depends on what caused the Guru and corruption. If the SD card is dead, there is nothing you can do. Just replace it and start from scratch. But if the SD card still works and only some stupid software wrote some stupid things to it, then it could probably be recovered. Of course it still depends on what stupid things have been written to it.
Do you have an Amiga or emulator with Kickstart 2.0 or higher where you can connect the SD card to? All recovery software I can suggest needs Kick 2.0 at least.
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