: Ensure no other application is using the assigned COM port. Cable Quality

: Some specific ASR bootloaders or configurations alter the default baud rate to 115200 . Switch your terminal settings if 9600 fails.

For further information and support, consider the following resources:

: Connecting a USB cable generally disables the RJ45 console port on the router. Unplugging the USB cable re-enables the RJ45 port. Safe Downloading Practices

Extract the macOS variant driver folder from the official package.

lsmod | grep ftdi_sio # If missing: sudo modprobe ftdi_sio echo "0403 6015" | sudo tee /sys/bus/usb-serial/drivers/ftdi_sio/new_id

Thus, translates to: I urgently need the driver archive for the USB console port on my Cisco ASR 9000 series router so I can terminate my serial session immediately.