Sorry I do not have one but I will take a SWAG as I found this: “To program or set a MAC address on the Giga E1, you typically need to access the device's firmware or configuration settings through its development environment, such as the Arduino IDE. You can use specific functions or libraries provided for the Giga E1 to set or modify the MAC address as needed.” You need to go through the documentation that came with it and what is referenced.