I had the same problem, third try it worked. Follow this: 1) Good connection to Mac, direct to USB port (do not use keyboard or hub) with original Nokia cable. 2) All apps shutdown except for terminal, screen saver/sleep shut off. 3) Card removed from 770 (this is a gotcha!). The above may just be ritual, but computers are magic, aren't they?
1) Good connection to Mac, direct to USB port (do not use keyboard or hub) with original Nokia cable. 2) All apps shutdown except for terminal, screen saver/sleep shut off. 3) Card removed from 770 (this is a gotcha!).