No reason to update unless you have a specific reason. There is an update for mine but I didn't do it as everything works perfect.
Navi update takes between two and four hours, so it can get quite pricey to have it done, without a real benefit.
Updating should only be done with a specific problem that needs to be addressed, or if you are retrofitting combox for Bluetooth streaming and need to update the software to be compliant.
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