Quote Originally Posted by lolypop000 View Post
Found out that this unit have rear usb port and you must connect your laptop ass external HD

Look here:

***Hidden content cannot be quoted.***
In that thread, they're talking about the 9980, not the 9990. The 9980 still had the mini USB port in the back of the unit - the 9990 does not. I haven't tried connecting through the regular USB cable, but the whole point of my thread is that it's unnecessary. I managed to load the new maps with a USB stick. However, I'm still not quite clear exactly which files are indispensable and which are unnecessary.