MacDive Forums

You would need to paste what you are typing, but I expect you are typing:
Which will give you the error you are seeing. First, that is incorrect. Second, tty.Bluetooth-Modem is incorrect anyway. The D4i is not connecting via bluetooth. Follow the instructions closely. Start by typing:
Paste the results here so we can tell you what the correct device to use is. Also, this is all kind of secondary - what is the actual problem you are seeing? Maybe you just need to go to Preferences -> Advanced -> Scan For Serial Port and choose the correct one.

I go to preferences and choose /dev/tty.usbserial-ST000001, so I begin import and and appeared the following message
Failed connecting to dive computer on serial port '/dev/tty.usbserial-ST000001' (Error Code: -6)

For a D4i, that is the wrong serial port, indicating you have the wrong cable. This is covered on the main page of the help:

http://www.mac-dive.com/help/index.php?title=Main_Page

Yes, but I talked with the Suunto representative in Portugal, and he told me that the cable is the same for D4 and the D4i!
He also does not work with DM4, so I assume that is the wrong cable, correct?

Yup. It is a new cable.