While there are many IOS files, IOS56 is famous in the Wii homebrew community for one main reason: It is the "Golden IOS" for USB Loading.
Apple’s iOS development cycle includes internal build numbers that never reach the public. For example, a build might look like 21A5268h (where 21 indicates the major iOS version and letters/numbers track minor revisions). ios5664v5661wad updated
The string 5664v5661 resembles two different build numbers or chip revisions (e.g., 5664 vs 5661), possibly tied to modem firmware, Secure Enclave, or a prototype device. The wad suffix is unusual—it could stand for: While there are many IOS files, IOS56 is
If you encountered this string in Xcode logs, a system diagnostic report, or a configuration profile, it may be an internal identifier for a pre-production silicon validation test. However, without Apple documentation, its meaning remains speculative. If you encountered this string in Xcode logs,
If you are attempting to install this file manually: