As far as I know... wads are NOT EQUAL to license keys.
You probably messed up your entire Wii's IOS, or in other words, corrupted the files that makes the console function.
I'm not sure if it's called "Banner Brick" but as long as you have a backup of your original NAND and a way to access BootMii / PriiLoader, you can revert back your entire Wii's "Operative System"