How to Put Codes on Your SD Card Into the Gecko OSby David Weinberg ; Updated September 22, 2017
Installing homebrew software on a Nintendo Wii can allow you to run homemade applications that provide additional functionality. Gecko OS is a homebrew program that allows you to apply a set of cheat codes in a GCT format to a game running on your Wii. You can download and edit the codes on your PC and then transfer them to your Wii via an SD card.
Visit Gecko Codes in the Resources section. Find the game that you would like to download codes for using the directory on the left side of the page.
Select the region of your Wii using the drop-down box on the right side of the page. Click on the “GCT” link to edit the code file.
Edit the code list. Delete any codes that you don’t want to use and edit the ones that have variable parameters. Click “Download GCT.”
Save the file to a folder titled “codes” in the root directory of the SD card that you use in your Wii. Do not change the name of the file itself.
Insert the SD card into your Wii along with the game that you’d like to play. Launch Gecko OS and select “Launch Game.” Gecko OS will search your SD card for a code file and then apply the proper codes.
Installing homebrew on a Wii will void the warranty.
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