Supersedes Technical Service Bulletin Group 91 number 12-65 dated October 25, 2012. MMI 3G+ Sound system "popping" and various other technical Issues (K0715 Update). Only apply this bulletin to vehicles if the customer complaint is in the correct group. Applying the update to vehicles outside of the appropriate group can cause repeat repairs and the warranty claim may be denied. This bulletin only applies to vehicles with Navigation Plus (PR Number 8DY). The applicable vehicles can be clearly identified by the SIM card slot on the faceplate of the front MMI mainunit.