0x18f.01 is old, the first release I think. Your IRD is perfectly fine, it's the firmware version that doesn't support transport stream output via GigE. Once you upgrade the firmware, GigE will have an option to configure it's interface and the address for the transport stream, either unicast or multicast. The reason why you see the ASI output is locked is because of the broadcaster. They have the option to enable it or disable it. It'll output via GigE nonetheless.
Firmware upgrade is either accomplished via over the air download (I have no idea which mux you'd find it) or via network to the 10/100 port only. There is a firmware upgrade utility from Motorola called kflash which will load firmware packages to the IRD. If the firmware upgrade goes wrong, which I have had happen to me on one DSR-4530, you need to have it repaired. I can send you the latest firmware I have, 0x1DA12 I think, I forget exactly which version. After the upgrade, you'll be able to configure the GigE port and have access to the transport stream via IP. One of the great things I like about the DSR-4530 is that you can use it as a cheap ASI to IP converter. I have the ASI output of a Scientific Atlanta D9850, tuned to PBS HD03 and HD04, connected to the DSR-4530, and I have access to the PBS mux on a multicast address. You have to configure the DSR-4530's input port to "ASI in". It works beautifully.