Gecko OS is a software application for the Nintendo Wii. It is primarily intended for users to run homebrew software, games that are region-locked and cheat codes, but it may also be used to run unauthorized copies of software.
Another feature of the application is the ability to stop automatic updates on games played from discs. Gecko OS is loaded from a secure digital, or SD, card or a high-capacity SD card if the Wii is running a firmware version 4.0 or higher.
Gecko OS is a form of homebrew software and is not supported or authorized by Nintendo. Installation without following the correct procedure may permanently "brick" the Wii, or render it inoperable.