When you load UWizzard you need to enter some keys for the program to function correctly: Wii U Common Key: D7B00402659BA2ABD2CB0DB27FA2B656 Wii U Espresso Ancast Key: 805E6285CD487DE0FAFFAA65A6985E17 Wii U Starbuck Ancast Key: B5D8AB06ED7F6CFC529F2CE1B4EA32FD This is done on the settings page as seen below: You can now use the WUD manager feature, a WUD is essentially an encrypted Wii U ISO, follow the steps below to extract your WUD to files / folder which can be used with Loadiine GX2.
Converting Wii U WUD image (essentially a Wii U ISO) to a format that can be used with Loadiine GX2 is very easy.