Garmin 2597 not recognized by desktop or laptop

[zillah]

Dear Experts

I bought my used gramin nuvi 2597 from a friend of mine and I was trying to update the map via my desktop and laptop using garmin express, but unfortunate garmin express was not able to recognize the GPS !!!!

I had used two different genuine mini USB cables not only one cable.

Garmin gets charged via its USB port but not recognized when gets connected via the same USB port!!!!

Both laptop and desktop have windows 7 ultimate installed on it

Thanks

 

[Nuvi-Nebie]

I would ask the friend you got the unit from if he / she has connected to the unit using Garmin Express and whether they used Windows 7