Looks like the manufacturing interface is not enabled in the device.
Please follow the below instructions to enable the manufacturing interface.
1) Connect the device to the pc and note down the com port numbers which it is bound to.
2) open command prompt.
3) Navigate to USB-Serial SDK installation directory -> bin
4) execute the command: cyrecovercdcdevice.exe #com number.
Refer to the attached screenshot 1.
5) open USB-Serial Configuration Utility. You can find the MFG interface.
6) connect and enable manufacturing interface and program the device. Refer to the attached screenshot 2.
7) Reset the board. You will be able to find the device in the configuration utility.