I'm not an RNS-D expert but 8B0 is not a valid model line. If this unit is a 8D0 035 192 G it's the newest A4 B5 Euro RNS-D you can get. For issues using it in the US you should check the quick links here or browse to http://www.nav-plus.com which has lots of info about the RNS-D.
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