hello i have just buy the razer blackshark v2 and i download razer 7.1 surround sound but i do not know were is the activation code and when i enter my device serial number to razer link to give me the ( Your Razer device is not eligible to receive a 7.1 Surround Sound activation code. Please refer to 7.1 Surround Sound System For Gaming Headset for eligible products. )