My SPA8800 has firmware 6.1.7 (GW). The Quick Start Guide lists an IVR Action # 201 for setting the device mode for Router/NAT or Bridge/Switch. The IVR however reports this option to be invalid. Web interface does not have the option either. I would like to use the Bridge/Switch mode. Will this require a firmware update or have I missed something configuration wise ? Where do I find the required firmware update ?