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I bought a 73sv non chirp when cabelas clearanced them out over the winter. It's registered in express along with my 2 93sv chirps. The build date is late 2015 according to the unit. I went to do my free map updates and it only let me download 1 map. I thought "no big deal, I'll just copy it onto each SD card and I'll be golden. It worked for both of my chirp units but the 73sv said it could not unlock the map. Any ideas?
Someone else had a similar problem recently. It was an issue with Express not having the registration on one of his units.
Be sure the 73 is registered correctly in Express and if it is, then you need to call support and see if they can fix it.
It is showing on my express...whether that means its registered properly or not is another thing. It was originally registered under mygarmin. I emailed them tonight so we will see what they say. I still have my emailed receipt so I'm not too worried about it.