I bought the IR 20 from universal remote and its worked perfectly to me. I had to get an IR remote because all my equipment in the closet behind the tv.

The remote worked with AT&T but since then I had to switch to Comcast and I cannot find the code to make the DCX 3400 work my IR 20 remote

I tried all the codes in the manual as well as others I have found online but no luck. Do any of you fine people have a code that will work or solutions how to make this work?