in garmindevice.xml it said nuvi 37xx. In my friend device it said nuvi 3790.

on the bottom of the device it said nuvi 3790 with the serial number.

I edit the garmindevice.xml and put nuvi3790 but when I unplug and reboot it goes back to nuvi 37xx.

this is part of my garmindevice:
- <Model>
<PartNumber>006-B1101-00</PartNumber>
<SoftwareVersion>410</SoftwareVersion>
<Description>nüvi 37xx</Description>
</Model>


and my friend garmindevice.xml:
- <Model>
<PartNumber>006-B1101-00</PartNumber>
<SoftwareVersion>410</SoftwareVersion>
<Description>nüvi 3790</Description>
</Model>

Now i'm going to try to rename garmindevice.xml as you said.