I think that could be your problem mine is at 1.0.14 june 2004 showing yours as the previous update you might have to hook it up to directv sat feed so it can take the update to accept the broadcast flags that all ota hd stations have to transmit eventually,I don't think you need a sub for the receiver to update in the stream. I have mine hooked up to a dish to get the guide from directv for the buffalo stations called "local stations" with an old hu card.
Try this link from Samsung [Link: product.samsung.com]