Is the GUIDE only for 4.1 SM as the title says. My Wii's are on 4.0U, I am planning to remove preloader on the Wii that has Bootmii on boot2 and keep the preloader on the other Wii (the one with Bootmii as an IOS). Maybe I can do the same and just download the 4.0 SM rather than the 4.1 on the GUIDE?? Or is it better to upgrade it to 4.1?