The connection to the remote is generic. There is something wrong in the connection path.
1) The remote you got is defective and that's the reason they sold it.
2) The USB cable you are using is defective.
3) There is a driver issue in Windows (you are using Windows? You didn't say)

Does your MX-900 connect to CCP with no problem using the same cable. If so, this would point to a defective X8 remote.
Could check the miniUSB port on the X8. Use some canned air to blow out the port and see if it connects.
Also (without the cable connected to the computer) try plugging it in & out a few dozen times to scrub any corrosion off the pins. Then try connecting.