According to Nintendo support, pressing and holding the power button resets the system. When the power turns off, the power button should be pressed again to turn the device back on. The reset is now complete. This process resets all types of Nintendo DS devices, including the Nintendo 3DS, Nintendo 3DS XL and Nintendo 2DS.
It is not possible to reset the Nintendo DS back to a prior version of the system menu. Once the system menu version is updated, it is unchangeable. If the user has issues with a Nintendo DS freezing, a complete reset is not necessary. The user simply holds down the power button for about 10 seconds, until the system powers down, and then he powers the system back on.
All versions of the Nintendo DS are less likely to freeze if the latest system updates have been installed. Otherwise, they may be prone to periodic freezes. If the Nintendo DS freezes only when a certain application or specific game is in use, the user should see if there is an update to the game or application available at the Nintendo eShop. If an update for the game or application is not available, the user may use the Nintendo DS Download Repair Tool to check the game or application for errors, and repair them if needed.