Things You'll Need
Instructions
Download an Action Replay code list file from the Internet. These files come in .XML format. You can find them for individual games on fan sites.
Insert a MicroSD card into your computer's SD card reader. If your computer does not have one, you can use an adapter for a full-size SD card reader or a USB adapter. Click "Open Folder to View Files" in the Autoplay menu.
Drag and drop the code list files into the MicroSD card folder to copy them to the card. Eject the card from the computer, and insert it into the MicroSD card slot on your Action Replay Cartridge.
Turn on your Nintendo DSi, and boot to the Action Replay cartridge.
Click "Files." Highlight a code list to import, and press the "A" button to import the codes.