Updating/deleting maps

this prob was luck for me but on day my garmin nuvi didnt show under my computer so i unplugged for one usb port and hooked up to another and i recognized it. again you can try it, im not saying thats the answer.

Nope, I even tried a different laptop, and it was still not reconized...There must be a switch or something that tells the unit to go into storage mode, like my streetpilot does.
Thanks for your help.
Glen

The c340 will not show up as a drive on your computer.Not a mass storage unit.Had one for over a year.According to the life time maps page https://buy.garmin.com/shop/shop.do?cID=256&pID=33379 when you click product it shows compatible.

Edit.Copied this note from the Garmin update page. The updates you receive under the subscription will be updates to the same map Data originally included with your Garmin product when originally purchased, or updates to map Data that you purchased separately (if applicable). If your Garmin product does not include, or you do not purchase separately, the map Data you want to update using your nüMaps Lifetime subscription, then you must purchase the map Data separately before you can load the updated map Data onto your Garmin product. In some instances, your Garmin product might not have sufficient memory remaining for you to load an update to the same map Data originally included with your Garmin product (or purchased separately, as the case may be), in which case you will need to select reduced map Data coverage for your updates.