When using the latest firmware (v203), if you need to use both SSD and H2N while recording, please use an USB Hub 3.0 and pay attention to the order of connecting these devices.
1. Power on the camera, connect to camera control app. Enter preview interface to ensure it's able to acquire image.
2. Please firstly connect the USB hub with Pro.
3. Then connect other device, and make sure that your connect H2N at last. Please notice that H2N needed to be boot and set before connection.