User manual in french

Hello,

The Garmin security lock can only be unlocked or changed with the 4 digit pass code.
The pass code can only be reset by entering the original pass code or sending it to Garmin to be reset.

Contact Garmin Tech Support for assistance.
1-800-800-1020

Hi, according to the Garmin user manual on its device, if you forget your pin and security information that will enable you unlock your Garmin device, you must send your Nuvi to Garmin to get it unlocked. You must also send a valid product registration or proof of purchase.

You will need to recalibrate your screen. If the screen is not working at all, you can go search for the support article at Garmin. Use the keywords touchscreen and 600. This may temporarily fix the problem, but if you have a lemon, the touchscreen may need to be replaced. (The solution is also posted at this site from other users.)

In some nuvi models there is a reset button.But in some nuvi models there is no reset button.you have mentioned only garmin nuvi but not mentioned the model of the garmin nuvi.But still i will mention the reset button location of some garmin nuvi models.Hope that helps you.
The reset button/procedure for garmin nuvi models
In order to reset Garmin device or enter into maintenance mode, perform one of the following procedures:

Power off Garmin unit. Press on continuously the upper top left corner of screen and then power on the unit by pressing once on the Power button. You should be prompted to clear all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.
above works on Garmin Nuvi 660, 680 series.
Turn off Garmin device. Press down on bottom right corner of the touchscreen, and then power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.
above works on Garmin nuvi 200, 250, 360 750, 760 series unit. Garmin Nuvi 360 on how to perform the hidden reset function.
Reset button on the bottom of the nuvi backside.
Click on the link below to get the exact location of the reset button.http://www8.garmin.com/manuals/1512_SetupandGo!.pdf also check out this link too http://www8.garmin.com/manuals/Nuvi350_OwnersManual.pdf Thanks. keep updated for any more query.you can rate this solutionand show your appreciation.

Yes, please see this link:


http://www.sharc.net/gps_LCD_repair.htm

- Jim

Hello :

It's a common software problem with your device . To correct the problem I recommend you to reset it .

Here is how to reset your device :

1:Turn the Nuvi on.

2:Touch the tools icon on the main screen. The tools icon is represented by a wrench surrounded by a blue circle.


3:Touch the "Settings" icon which appears as a wrench.

4:Push the "Restore" button at the bottom of the screen. A confirmation message will appear asking to confirm restoring the Nuvi to factory settings. Push yes to restore the factory settings
............................................................................................
Try this for hard reset .

Turn off Garmin device. Press down on bottom right corner of the touchscreen [ Don't let go ] , and then power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.

PLEASE DON'T FORGET TO RATE !

Nope, the PIN is set by the original user and can't be broken. Even Garmin won't reset it without an original receipt from a Garmin dealer. If you weren't given the PIN when you bought it second hand, it was probably stolen.

There is NO master reset code. Whoever told you this was wrong. You have to use your security location to unlock it. Otherwise, you have to send it in to Garmin with the original receipt from an authorized Garmin dealer. This is to prevent use of the unit in case of theft.

I think you have to send it back to Garmin. Liam

not sure if this link will help you but have a look.
how to download updates Garmin Nuvi 680 Google Search