Okay, so my friend's wii is on 4.0u.
We used Bannerbomb and Hackmii to install HBC, DVDx and Bootmii onto the Wii. Bootmii was installed as an IOS and a boot2.
Afterwards we tried installing IOS16-64-V257-prod.wad, with wad manager. as well as severall IOS36 wads so that we could install...