Instructions
Re-enter any recently inputted cheat codes. Occasionally, incorrectly entering a cheat code can cause severe problems with the way the device interfaces with the game you are playing. Double-checking any recently inputted codes can often quickly fix a problem without removing any data from the device.
Remove any recently inputted cheat codes even if they are all entered correctly. Click on the codes listing. Select multiple codes by pressing the "Shift" or "Ctrl" keys. Press the "Delete" button. A confirmation window will appear, and the code will be deleted. Removing any recent codes can restore your device to a previously working state.
Upgrade the firmware of your Action Replay DSi. The Code Junkies website has released several updates for the device that improve stability and limit errors. Download the firmware from the website. Connect your Action Replay DSi to your computer. Double-click the downloaded file to install the update. Agree to the "Terms of Service," and the device will be located and updated automatically.
Remove all of the cheat codes on the device. Follow the same process as in Step 3, going through the sections of codes one at a time. It can be time consuming, so only remove all codes as a method of last resort.