Open Project Designer and press update to ensure you have the latest firmware downloaded, then connect the Switching Relay - 4 to a computer via USB, and then a box appears if there is a newer firmware than the one in the device.
Open Project Designer and press update to ensure you have the latest firmware downloaded, then connect the Switching Relay - 4 to a computer via USB, and then a box appears if there is a newer firmware than the one in the device.