Yes, that's the UnitID and there is no good reason to want to change that. That is, unless you are wanting to clone another unit (which is not a 'good' reason). Maybe, i've missed something here but i thought you were wanting to change the Model Number from 3760 to 34xx to display on your nuvi splash screen and in WebUpdater as you posted here:
Quote Originally Posted by pusti123 View Post
I converted my 3760 into a 3490. Everything seems to be working fine.
But one question remains. During booting I still see 3760 and the WebUpdater also recognizes a 3760, is there a method to "correct" this issue?
Is that what you are trying to achieve, when you said that you wanted to "correct" this issue?

Also the part quote in your post above is from the GarminDevice.xml from a 3750. I'm now confused.