(often referred to as CDecrypt v2.0b ) is a specialized command-line utility used to decrypt and unpack Wii U NUS (Nintendo Update Server) content files. Originally created by the developer crediar , this tool is essential for modders and users who wish to convert encrypted game files into a format compatible with emulators like Cemu or for manual modification.
: Ensure your game folder contains the necessary encrypted files, specifically title.tmd and title.tik .
To mod a 3DS game (e.g., change textures or levels):
: Version 2.0 often includes improved argument handling where the tool can automatically find the required .tmd and .tik files if you point it at a directory. Core Usage and "Complete Text" for Operation
Enter the following: CDecrypt_v2.0b.exe title.tmd title.tik .
If you get “Cannot retrieve common key” error, create keys.txt in the same folder as cdecrypt2.exe with content: