You may need to install the USB drivers from the CD that came with your unit in the box. Just load it up in windows. Manual will tell you how to do this, or you could Google the correct driver. If your i3 is recognised correctly, it will be shown in your task bar when you click on the USB icon...
The i3 comes with a 128MB micro SD card - first can you be more specific as to what you refer to as "not recognized"? Do the usb drivers install correctly and after installation is the i3 recognized by your pc once you hook it up with the USB cable? Is the micro SD card in place? Is it all the way in the slot?
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Install the Garmin City Navigator Cd to your pc and then connect ur garmin to ur pc with the USB cable. You might have to unlock the maps with information provided with ur garmin like ur unit ID and ur unlock code. Another possiblity is that ur memory card is gotten corrupted so try installing it on a different micro sd card. Let us know if u have any luck.
Sounds like your battery died and there's no juice to it. When the battery is low, the unit shuts itself off and has a hard time starting up. If possible, try plugging in your unit with a USB cable from the computer and leave the computer on for a few hours and see if that doesn't solve the problem. When in the car, sometimes the cigarette lighter socket comes loose.
Regarding your i3, the USB drivers must be loaded BEFORE you connect your garmin. If you do not have your USB drivers, you can download them from:
GARMIN offers a free download called "WebUpdater" for these products. Once you have the GARMIN USB driver for this unit installed on your computer (also avail. at GARMIN.com), you can run the WebUpdater, and it will update all known updates to the unit.
The Garmin C340 comes preloaded with maps while the I3 require that the maps be installed onto a micro sd card.
You can place the micro SD card into a SD adapter and use a regular card reader to download your maps. When the software ask for 'Device' to download to use the drop down arrow and find your drive letter associated with the card reader. Using a card reader will be much faster since the it is ubs 2.0 vs ubs 1.1
You could also go to Garmin website and download and install the USB drivers, see link below.
A way around this is to insert the SD Card into the computer (SD Card reader), point the directory to the card and install the maps like that. I had to do that the first time I bought my unit because I couldn't figure it out and got frustrated. So I thought of this easy work-around.