For a physical console, there is no such thing as a "universal" NAND download. You must use a backup that was created on your specific console.
You do not need a "full" permanent mod to do this. Use str2hax or LetterBomb to load the HackMii Installer. Wii Nand Backup Download
: Open the Homebrew Channel, press the HOME button, and select Launch BootMii . For a physical console, there is no such