You can retrieve HWID in GarminDevice.xml in your nuvi, for example this from a 3790:
but it should be 827<?xml version="1.0" encoding="UTF-8"?><Device xmlns="http://www.garmin.com/xmlschemas/GarminDevice/v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.garmin.com/xmlschemas/GarminDevice/v2 http://www.garmin.com/xmlschemas/GarminDevicev2.xsd"><Model><PartNumber>006-B1101-00</PartNumber>
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