"you connected a extra lead between channel 4 from the cortex to a free port on the cb? , since you cant use anything else then a receiver on a CB rx port"
Nope. The CortexPro had the two receivers in ports A&B and ports 5&6 went to the CB200. This is the standard setup as instructed by BD.
"What software version was your Cortex Pro at and were both RX's connected to the CB200 via the Cortex?"
I updated all devices to the latest firmware as of January 2021.
Thanks for your thoughts.