My unit ID (3827336719) appears numerous times in the Express.log and subsequent files (files usually indicate it is looking for the device but eventually not attaching).

I do not own any other 13xx or 14xx Nuvi devices. My other Garmin Nuvi devices are 2300 and 2599 as well as a DriveSmart66. I have not attempted any updates of any other devices since I started fiddling with the 1350.

I am more than willing to assume this is truly a 0972 unit that is supposed to use a 630 GCD file. It's no huge loss if this 1350 ends up in the electronic recycle bin.