Well when I first softmodded my wii on 4.2, I wanted to play New Super Mario Bros. Wii, and I also had that wii disc update. Then one guy told me to go to wiibrew.org and download StartPatch 4.2, and I put it on my apps folder. Then I went to the homebrew channel, loaded the app and i then press a button and I clicked on "block disc updates". Then I saved and after that I could play New Super Mario Bros. Wii. But I don't know if it would work for you but try and if something goes bad, do not blame this on me cause any thing done on your wii is not held responsible by me. So try out the startpatch and tell me if anything changes.