I have no solution, but I can tell you Comcast Atlanta will not tell you if a device is compatible or likely to be compatible. They obstruct EVERY effort to get around preventing customers from renting their equipment. A friend spent multiple phone hours and multiple trips (4) to Comcast office for a functioning 'Comcast card' for a DVR device he purchased. One call made in my presence was transferred to 8 different people and the issue was not resolved. He finally contacted the Public Service Commission and the issue was resolved in 15 minutes. Cable monopolies, like the old AT&T monopolies, should be outlawed. They should be required to list compatible set top boxes as they are now required to list compatible internet modems. From what I have read, Comcast is not the only cable company that does this. I have read Time Warner is equally as bad.