Uploading a map of Iran onto a Garmin Zumo 660

My apologies for what is likely to be one of the most basic questions but although I think I have followed all the advice I have read I still cannot read the map of Iran on my 660.

I downloaded the map onto my MacBook Pro
I unzipped the map
I installed the map onto an SD 4gb card in the Garmin folder installed in the 660
I opened the 660 but there is no evidence of the map


ps - the map appears on my Garmin Basecamp on the MacPro
- the map is not recognised by JaVaWA DMG


pps I’m a bit of a techie numpty

There is a specific forum for Garmin Maps which might get you a better response.