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In most cases Garmin requires for the device to be plugged in, you have to use Garmin Express. Found here.... Garmin Express
The USB cable can be bought for cheap at any computer store, Radio Shack, Best Buy, etc etc.
I have a Nuvi 680. I bought a 4G SD card for more storage. Yesterday Garmin sent me a new map to install and now the Nuvi is telling me there is not enough space. Can't be! Nothing was ever installed onto the SD card since I only put it into the Nuvi today. Help, what am I doing wrong?
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.
I had the same problem. What caused it was the cable I bought at Radio Shack. I fit into the slot at the back of the device and into a usb outlet. But it was not a usb cable despite this. It was a battery charger. My computer did not detect the device though it recharged its battery. As soon as I purchased a usb cable at Radio Shack that connected to the same outlets as the charger, I was able to register.
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 have found the only thing that works thus far is to click on the red phone in progress icon then go to "call options" then click transfer audio to phone, then transfer audio to nuvi. Sometimes I have to do this twice. but it works.