You can do this by dumping the filesystem to the SD card, dumping the filesystem from a ROM file and then comparing them both using something like WinMerge
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Thank you! Fixer saved my Omega Ruby cartrige. Game crashed from time to time - after fixer run it verified without errors and runs as new!
Sadly, my Echoes of Valentia copy stuck in fixing on some chunks for days. It is sad, because some...