One of the primary reasons users seek a fixed version is the "Tile 0" or "WUD Metadata" error. Early rips of the game often missed critical update data required for the game to boot on newer firmware. To resolve this, many in the preservation community use tools like the Wii U Common Key to decrypt and rebuild the game files. A fixed ROM ensures that the game’s "RPX" executable is properly aligned, preventing the dreaded black screen on launch that plagued early homebrew efforts.
Patching memory leaks that cause the game to freeze during long play sessions or specifically during "Detective Mode". lego city undercover rom wii u fixed