Instructions
Place the "Action Replay Code Manager" CD into your computer, and follow the on screen instructions to install the Action Replay software.
Plug the mini-USB end of the supplied USB cable into the Action Replay cartridge and plug the other end into a USB port on your computer. Install the drivers for the device when prompted by the computer.
Click "Start," and select the "Code Manager" software. A window labeled "Action Replay DSi Code Manager" appears on the screen.
Right-click the four colored circles at the top left corner of the screen, and select "About Action Replay."
Click "Reset Hardware." The message "Are you sure you wish to reset your Action Replay Device" appears on the screen.
Select "Yes" to reset the Action Replay, then "OK" when the confirmation screen appears.