How to download the files from OpenStreet map to Nuvi3790

Hello all,


First of all thank you all for such a nice site helping people and teaching new techniques.

I am new in here. and I am lost with such massive load of information .

I could not find how to install the downloaded files ( Russia and Turkey) from your site to the Garmin Nuvi 3790.

I admit that i am dumb in technology :confused:

So would you please explain in details how to do it ?

I have the ru.cfo.7z file as an example downloaded on the windows computer.
as well as some strange files with number ( disk image files).
plus russia_gmapsupp file .

Either direct to the machine or to the \SD Card. ( I prefer Directly).

Thanks in Advance.