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A service bulletin that provides a technical update for the COMAND Head Unit Software of certain Mercedes-Benz models. The bulletin outlines the models affected, which include the 215, 220, and 230 series from the year 2005. It addresses issues such as audio problems during startup, navigation malfunctions, and errors with map displays. The document includes detailed instructions on the software update process, requiring tools like Star Diagnosis DVD. Guidance is also provided for checking the software version and submitting warranty claims if necessary.