I could not work out a way to recover from this as the upgrade failed (not fully complete) and the only option was to reset the unit via the power button.
When the unit came back up again the following error came up on the screen: "system software missing" The Nuvi would not boot! HOLD down the power button and you will see "Pre Boot Mode" appear on the lower part of the display.
Is it possible to copy a map file on my computer to the Garmin 350 and if so how?
If the Garmin 350 uses the Garmin files you can create these with mkgmap from Open Street Map data.
Select the “Download” option from Web Updater to install all available software for your particular GPS model.
I just purchased the Garmin nuvi 1490 with 2012 lifetime US maps and wanted to update my Garmin 350 with 2010 one time update maps.So you should have no trouble getting a quick signal, and one that will stay locked on even in areas where older GPS devices might have found challenging.You will also find that the Nuvi 350 is very light and compact.To shop on our Canada website, which ships to Canada only, please click the green button above. Hello All, I recently downloaded the Nuvi 660 firmware upgrade from the Garmin site to upgrade to v2.70.Getting Official Garmin Map Updates Using Maps from Other Sources Community Q&A Before you go on a road trip, you may want to update the maps on your Garmin Nuvi GPS device so you have the latest map data and won’t get lost.If you've purchased a map update or lifetime membership from Garmin, you can download map updates through the Garmin Express program.Along the top of the device is the power button providing easy access when mounted on your dash.Along the right side is the SD card slot, USB/power connector, and an audio jack for headphones.If you download an area of data, such as from Geofabrik downloads, mkgmap can use it to create the files for your Garmin.If the area is too big for a single file you can use splitter and then mkgmap to break the map data into chunks. You will probably find it easier to use some pre-built maps so have a look at this in the Wiki and you will have to see if your device can take a memory card or as enough built-in memory space.