Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Have you already tried connecting your Garmin to the computer..
And then opening and running the garmin express program?
Garmin express may be able to find software or firmware updates that you arent seeing on the garmin site. So connect the garmin to your computer and run garmin express, and let it install any updates it finds for the Nuvi.
let me know if you get stuck or run into any issues.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.