Instructions
Deleting Individual Codes
Insert the Action Replay cartridge in your Nintendo DS, turn on the Nintendo DS and select the "Update" icon, which is the green button with the white asterisk on it.
Plug the small end of the mini-USB cable into the Action Replay cartridge and the larger end into a USB port on your computer.
Open the Action Replay Code Manager software on your computer. This is the software that you put on your computer when you first set up your Action Replay.
Click the "+" icon next to a game in the "Nintendo DS" section of the screen with codes you want to delete to free up space for other codes.
Select the code you want to delete and press the trashcan icon next to "Nintendo DS."
Delete an entire game from the code list by highlighting the name of the game and pressing the trashcan button.
Deleting All Codes At Once
Insert the Action Replay cartridge in your Nintendo DS and turn on the device.
Press and hold the "A" and "B" buttons after turning on the Nintendo DS.
Push and hold the "Start" and "Select" buttons while continuing to hold the "A" and "B" buttons when the "Action Replay" screen appears. Continue to hold all four buttons until the cartridge loads, which takes approximately 10 seconds. Once loaded, all of the codes are deleted from your Action Replay.