Well, you could try USB Loader GX, but USB loading requires a cIOS, which requires that you softmod it. So unless you want to softmod it, you will have to use Gecko. Gecko requires the homebrew channel to be installed, install it using this guide: Homebrew setup - WiiBrew, also, if possible, install Bootmii as boot2 (installing Bootmii as boot2 will make you wii unbrickable). If it cannot be installed as boot2, install it as IOS. Then, just place Gecko in the apps folder of your SD and you are ready to go!