Uploading Iran on to 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

Make sure the SD card is in Fat32 format.
With Javawa Device Manager you can make an online report and send us a link.