Jeff, your usb interface is a very old design and is most likely outside the 2-year warranty. I would suggest that you purchase a replacement usb cable from Ikarus USA. The replacement cable will be of the latest "usb key" design, and you will be able to use it when you choose to upgrade to AF5.

The old usb interface cable has to be returned to Ikarus USA. The cable will be exchanged for $29.95 plus S&H 8.95. Call Frank.

IKARUS-USA,
Service Department
1136 NE Pine Island Road, Unit 83
Cape Coral, FL 33909
Phone: 877-550-AERO (2376)