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.
With the discovery of the HW_AHBPROT register, new official IOS revisions with USB2 support, and integration of the HW_AHBPROT into the Homebrew Channel's access permissions field, most homebrew should no longer depend on a modified IOS in order to do things which normally would require them. Thus, homebrew which requires custom IOS should be removed and replaced with less invasive, more modern alternatives.
Non-piracy uses
Other software technically installs custom IOSes, but these IOSes do not have the piracy functions commonly associated with cIOS.
- Better hardware control with Wii-Linux
- Lower risk NAND/SEEPROM flashing
- Custom servers such as RiiConnect24
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