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2004 Rx330 Navigation Question

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The good news is I just purchased a 2004 RX330 with the performance package and navigation. The bad news is, the navigation package is version 3.1. Via ebay, I notice the latest released version is 9.1 and question if it would be more cost effective to update to the predecessor to 9.1. Also, has anyone physically performed the upgrade by following instructions on this forum? Any caveats?

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