I understand you're asking about an — a tool used to generate the security unlock code for Audi’s second-generation navigation system (RNS-E, model years ~2004–2010).
You need to access the hidden “Diagnosis” menu. To do this: audi rnse code calculator
: Some specialized services provide a downloadable ".iso" file that you burn to a CD. When inserted into the RNS-E, it performs a firmware update that displays the security code directly on the screen. Official Alternatives to Calculators Audi RNS-E code calculator I understand you're asking