I have acquired a few extra receivers from people who no longer subscribe. One of them is a 6131 which I wanted to activate but I was told by the CSR that I could not use it because the smart card was out of date. This model has the internal smart card but still has a card slot on the front of the unit. It was in use until approximately last fall with the previous subscriber. I have one other 6131 receiver in use currently and it works fine. Was there an updated version of the 6131? Does anyone have a list of what is supported and what is not?