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First, I want to thank all of you for sharing information and helping each those in need. Now I feel that I have to return the favor and contribute to online community.

I am sharing my hours and hours of testing and trying it again and again differently until I acheived success. I hope this saves you time and headaches.

I have attached a detailed guide with screen shots of the process that I used to successfully upgrade the Map on my Uconnect 430N RBH to latest Garmin City Navigator North America 2018.20. Here it is:

Dowload or open this Guide:
View attachment Complete Guide to Update the UCONNECT 430N RHB Map to GARMIN City Navigator North America 2018.2.pdf

All the best.
 

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So it is important to note so No one is confused that: 1) this works on the 2013 and prior radios. 2014+ it is hit or miss. 2) You will lose all Junction Views by loading maps as supplemental
 
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