I can't help you with the advantage disadvantage aspect of updating to 4-1/91. But as i mentioned if you use the search feature you will find tons of information that will provide the info you need. http://www.xoutpost.com/navigation-sy...rsion+4-1%2F91. For example using just "OS 4-1/91" in the search window i was able to find the link above in less than 5 seconds. Doing this will provide you with "detailed" discussions. Yes your dealer can update the OS free of charge provided #1 they Know about it #2 They have the latest update OS on hand. But don't let them try to charge you for it. Get it done in conjunction with some other service.
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Originally Posted by donnyboy1
Thanks for the info. My version is 4-1/70. When I get a chance I'll try out your suggestion. Any advantage of updating to 4-1/91??? If so, would my local BMW dealer be the best bet? Thanks again for the quick response.
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