Translations:3DS:Why not to remove custom firmware/11/en
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Nearly all cases where a game doesn't work are not due to CFW alone. Most commonly, a corrupt game file or a corrupt save file is the cause. Removing CFW would make it harder to diagnose a game's problems. Meanwhile, Luma3DS (the CFW) exposes more details about why a game doesn't work, allowing for more experienced people to figure the problem out, while stock firmware would only show a generic "An error has occurred" screen.