Thread: aera 795 stuck on 'Loader' after fw update (could getting Unit ID from GMA or UNL files help?)

You have an aviation unit and don't know what the map on the SD card is?
The map and it's associated files will most likely be unique to the card ID, not the device.
If you can provide the code in the UNL that map on the card can be identified. It's simply asciii text, use notepad or similar.
As for the device itself you could try contacting Garmin with the serial number and ask them for the ID.