Safety Precautions and Warranty Information: User manuals typically conclude with important safety precautions to protect users from potential hazards and warranty information, outlining the terms and conditions under which the product is covered.
A frequent problem occurs when the car battery is disconnected or replaced, which resets the unit and triggers an "Insert Correct Map Disc" error. Ndda W55 Manual 19
If you have an older version (e.g., Manual 17 or 18), compare with Manual 19 to identify: Report Title: Ndda W55 Manual 19 Introduction