Try a new SD card, sometimes they just go bad.USB Loader knows the file structure it likes better than anyone else, so it might help to just have it make a new backup that you can try. Try putting the USB stick in while empty and formatted FAT32 and make a backup of a game in the Wii CD drive.Second, run the USB Loader which will format your USB device and thus will prepare it. Preparation To sum up, first you have to run the cIOS Installer on an offline or online connection.
Again same as 3, make sure to back everything up. Homebrew Channel v0.9 Wabasi Zero (Modchip) Windows XP Computer SanDisk Titanium 8GB USB Keychain.
You could simply try deleting and recopying a fresh download of USB Loader GX onto the card first but I've found a full reformat makes a big difference. The USB Loader GX is a Wii Homebrew application that allows you to load Homebrew games and play them on your Wii with.
This is intended to help you learn how to use it, by giving you a quick start. There is no guide to use the USB Loader GX app. I've found cIOS - Wii Guide by RiiConnect24 explains a good working cIOS configuration. Insert your USB drive, and SD card if you’re using one, into your Wii and launch USB Loader GX from the Homebrew Channel.