mario galaxy not loading and another issue

hello I just finished softmodding a friends wii, he had version 4.1U on his, I did all the things on the tutorial here and the games that I have seem to be loading perfectly, but when I try to load the mario galaxy one It freezes on the launching game part and says something like @@R, does anyone know why is this happening with this game? It works perfectly on my wii, which was 4.0U version softmodded and I dont know if the problem has something to do with it being 4.1U.(I dont think he will be using that game but I want to know what is the problem that doesn't let it load. I have already patched the IOS that enables mario galaxy to run) (also on a different note, sorry for posting this here, I don't know where else to do it; I tried to install bootmii on boot2 and it seems to install correctly but when I reload the wii it does make the sound of trying to boot something but fails to open the bootmii and goes to the warning sign; he bought it on 2007, but I don't know if it is a LU64 model, don't think so but, how can I make bootmii window appear if it is not showing up at start with the sd card that has the booting files on it???)

bootmii not showing on start up is usually a direct result of a not 100% compatible sd card. It means that yes the card works but bootmii will not play nicely with it. I have the same issue my lexar sd card will not boot to bootmii however my kingston will.