I have the same problem with my RCA DVD player. I programmed the Comcast remote with the code 20522, but the red OK/Select button only works for the cable. I tried this solution to use the A button on the remote instead of the OK button but it didn't work for me. Is there a different sequence of codes for getting the OK button to work with the RCA DVD player?

Televison & Video - Universal Remote Control - Remote Control