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It is composed of 17 parts, 15 app parts and the ticket and tmd file.

This IOS was known to have SDHC support (System Menu 4.0 introduced SDHC support and IOS61 for the Wii Shop Channel also introduced it)

Version Signing bug? STM Release Exploit? Notes
v6174 No No First release. Used by System Menu 4.0 and System Menu 4.1
v6400 No No Stub IOS released alongside IOS70 and System Menu 4.2