Some power users install a patched IOS56 as their default system IOS (replacing slot 56) to allow disc backups to launch directly from the stock Disc Channel—a risky but popular mod in the early 2010s.
Homebrew developers chose for a critical reason: it is pre-4.3 security lockdown . Nintendo’s System Menu 4.3 (v5705) introduced stricter checks on WAD installations and blocked Bannerbomb and other exploits. By using v5661 as a base, cIOS developers ensured that their patches would survive and that the cIOS would retain legacy compatibility with older backup loaders. ios56-64-v5661.wad
When you install this WAD using a tool like or Multi-Mod Manager (MMM) , you are not installing a stock Nintendo IOS. You are installing a patched, unsigned version that the Wii’s system menu would normally reject—but because you have bootmii or a cIOS already running, you bypass those checks. Some power users install a patched IOS56 as
The file ios56-64-v5661.wad in homebrew repositories is almost always a . It is built from IOS56 but includes: By using v5661 as a base, cIOS developers
Dealing with WAD files is high-risk behavior for a Wii console. Incorrect installation can result in a (a useless console).