Did you press and hold the Tivo and that other button down until the remote light turns on? Then, you can press the code and then ENTER (not select).
TiVo HD 1TB (157 HD Hrs, PLS, "S3HD")
Roamio, Oh Roamio!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!