Custom IOS

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Custom IOS, aka cIOS, are third-party IOS files that are installed on the wii. Most cIOS's are used for pirating. They are often made by using a base IOS with desirable features, such as USB support or Rockband microphone support and modified to install to a different slot such as 254 and then add extra features, such as restoring the trucha bug and adding piracy related functions.