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Unlike the home consoles, and the Sony's rival PSP conveyable gaming system, the Nintendo Dual Screen (DS) does not save game data to the program itself. Instead, game saves are written directly to the game cartridge. This means that while you wish to erase DS game data, you need to do so on each cartridge individually. This remains generally a fairly easy process, accessible from your game's principal choices menu. If your game does not have one choice to remove data from the principal menu, there is a hard-cartridge reset option that works by means of most titles.
Difficulty: Moderately Easy
1 Strength on your DS with the game cartridge you desire to remove data from inserted. Once the game loads, examine the major menu for exclusive "Options Screen", if your game features this screen, here ought to be an available choice to "Delete All Game Save Information?" Select this choice to delete your game information.
2 If your title did never have the option to delete game data automatically, power off your DS. Remove any game cartridge inserted into the method, after that power it up again on. Once you are in the primary system menu with the DS, insert a cartridge that you desire to erase data out of. You need to see an icon appear that corresponds to the inserted game.
3 Click the icon for your game cartridge, and quickly press and carry the "Some," "B," "Y," "X," "R," plus "L" buttons simultaneously. This will execute a difficult reset of the cartridge data. Observe that there are a few game titles where this method will never work.
Be definite that there remains no game information you wish to retain previous to attempting a hard reset of your game's information. All data will be lost and cannot be recovered. games.
References website: Game Manuals GameFAQS: Answers