When the Nintendo DSi launched in Japan in 2008 (and globally in 2009), it was not merely a hardware revision of the DS Lite. It was a philosophical shift. For the first time, Nintendo introduced a console with internal flash storage, two cameras, an audio player, and—most critically—a connected digital storefront (the DSi Shop).
Always perform firmware operations with a full battery or while connected to a power supply. Nintendo Dsi Firmware Download
Extract the downloaded Twilight Menu++ archive and move the _nds folder and the booter.nds file to the root directory of your SD card. When the Nintendo DSi launched in Japan in
Place the downloaded pit.bin file into the 484E494A directory. Always perform firmware operations with a full battery
The only official method to download and install a Nintendo DSi system update is directly through the console's own internet connection. Nintendo has never provided the firmware as a standalone file for manual download on its website. Instead, the process must be initiated from the DSi's System Settings menu.
Origins and purpose