ERROR MissionPlanner.MAVLinkInterface - System.Exception: Can not establish a connection

We have a required to have secure boot for Arducopter CubeOrange board, I have folllow the below link for install the secure firmware.
Installing Secure Firmware - CubePilot.
After following above Arducopter not able to connect using Mavlink communication and giving error “No Mavlink Heartbeat Packets where read from this port - Verify Baud Rate and setup” and I have checked in device manager with USB port was giving error as “This device cannot start. (Code 10) A device which does not exist was specified”.
Please guide me on this.