Are you sure about the HWID of your unit? If you have a files backup check it in garmindevice.xml in Garmin folder.

<?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-XXXX-00</PartNumber>