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Do you have a computer to work on your Garmin with? that may be needed.
And, is it a Windows computer, or an Apple computer, please?
I understand, and it's a shame when devices won't work, suddenly, in this fashion.
I would advise you to download and install Garmin Express software onto your computer.
Then connect the Garmin Nuvi to the computer.
Then run Garmin Express, and update the Garmin device.
This may fix the Nuvi device's problem, if it is simply a matter of corrupted internal software on it.
When dealing with an update for your Garmin device, it is best to simply download, install, and use Garmin Express.
and (if you have a Windows PC) click on the big blue Download button at center bottom of the page. (If you have an Apple, click on the nearby Download for Mac link.) And download Garmin Express' installer to your computer, save it, then double-click upon it to install Garmin Express.
Then start the program, Garmin Express. Then connect your Garmin device. Then use Garmin Express to update your device.
Let me know how that goes, please. Thanks.
Then it is probably 'broken', I'm sorry to say.
One thing to try: removing the battery for a long period (overnight, for instance.)
Then putting the battery back in the device, and trying it again.
It's the one thing left to try, aside from deciding whether to have it repaired by Garmin, or replacing it. (I can tell you how much the repair by Garmin will cost you, since it is out of warranty.)
You would have to unscrew the cover - no matter, since it is broken and out of warranty, so it won't void the warranty.
Flip over the device, locate the retaining screws, use appropriate screwdriver, and eventually take the cover off.
The battery will be unmistakeable: a large square or oblong component, with two wires (or possibly with terminals, like a cell phone battery usually has.)
Unplug the connector at the end of the two wires coming from the battery.
(To re-connect and close up the Garmin, reverse those steps.)
Then the battery is not user-removable. Or perhaps the case of this model is hard to get open, in simple terms.
Are there round rubber pieces, rather small, the size of a screw's head?
If so, pry one of those out, and you will see a screw head under it.
If there are several, pry all the small round rubber pieces off, and the case screws will be under them.