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Today I had my firmware upgrade on my 2009 BMW 135I to be like a NZ new model and replace the japan software that it had on it. Everything went fine and I got radio + Navigation through a place in town which does work for our local BMW franchisee. However, on driving away the sound quality was really poor (No bass and really quiet) and the radio reception was really poor....my gut feeling from putting in older style radios in older style cars, was cables were in backwards or similar, but the electrician assured me that could happen with this. He is getting some software/computer to do some testing on Monday...but really interested to know what your thoughts are on this and what may have caused it?
