The last official version from Nintendo was v3867 (found on System Menu 4.1). Any version number higher than 3867 is a modified/custom IOS.
When softmodding a console following modern standards, such as the Wii Hacks Guide , users must install custom IOS modifications (cIOS). Programs like the take clean, official Nintendo IOS files and patch them to allow homebrew code execution. Ios38-64-v4123.wad
Obtain the version for your computer operating system. The last official version from Nintendo was v3867
18;write_to_target_document1b;_6ALuacjPM_uanesP_orn0AI_100;57; 0;f5;0;195; Programs like the take clean, official Nintendo IOS
For a complete, guided setup, is a popular Windows application that automates the downloading process. By selecting a standard cIOS installation guide within ModMii, the software automatically fetches IOS38-64-v4123.wad alongside other critical files like IOS56-64-v5661.wad and IOS57-64-v5918.wad . Troubleshooting Common Installation Errors
If you are performing a full cIOS setup, you typically need these files together on your SD root: IOS38-64-v4123.wad IOS56-64-v5661.wad IOS57-64-v5918.wad IOS58-64-v6175.wad cIOS - Wii Hacks Guide