Never copy someone else’s config.ini . That file controls your hard drive settings, video mode, and game paths. Using another user’s config could make your USB drive unreadable. Only copy the themes folder.
Sites like wiibrew.org or curated Google Drive folders linked by prominent YouTubers (such as Modded Warfare or Nintendo Homebrew channels) are excellent resources. usb loader gx themes download
Go to Settings > Theme Menu . Select your new theme from the list and hit Apply . Never copy someone else’s config