Things You'll Need
Instructions
Check for the latest firmware updates for your Action Replay. Hook your device up to your computer using an USB cable. Any available updates will download and install automatically.
Disconnect the Action Replay from your PC.
Put the Action Replay in your Nintendo DS system.
Turn on the DS.
Pick the game you want to install from the list that appears. If you don't see the game you are looking for, hit "Add New Code" to input codes for other games manually.