Fixing a Game Corrupted by Action Replay: Load Backup, Delete Save, Re-dump ROM, Hex-Edit, Community Tools

Action Replay writes directly to save/ROM; there's no "undo." Recovery options:

1. Load pre-AR save – if you backed up before cheating.
2. Delete corrupted save – start new game (only loss).
3. Re-acquire clean ROM – from your own cartridge (dump via Retrode/GB Operator) or legitimate digital purchase (Virtual Console, NSO).
4. Hex-edit save – advanced: compare clean vs. corrupted in HxD; revert changed offsets. Requires known good save structure.
5. Community save editors – some games have tools (e.g., PKHeX for Pokémon) that can repair flags.

Prevention: Always back up saves (SD card, PC) before using cheat devices. Use cheats on copies, not primary files.