To perform an official system update:
The final official firmware version for the Nintendo DSi is (available in U, E, J, and A regions). Version: 1.4.5 Nintendo Dsi Firmware Download
Downloading copyrighted firmware, BIOS files, or system software from third-party websites is generally considered piracy and is illegal in many jurisdictions. These files are the intellectual property of Nintendo. I cannot provide direct download links or assist in pirating this software. To perform an official system update: The final
Remember, while hacking your DSi is safe if you follow the instructions carefully, there is always a tiny risk of bricking your device. Always keep your console charged during the installation and back up your SD card beforehand. I cannot provide direct download links or assist
Here is a comparison of the two ways to "update" your DSi:
It leaves your internal system memory (NAND) completely untouched, making it incredibly safe. It allows you to customize the DSi menu with custom themes.
For more official details on maintaining your legacy console, check out the official Nintendo Support page .