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).
Series 2 (80 hrs,PLS, Pending sale)
TiVo HD 1TB (157 HD Hrs, PLS, "S3HD")
Roamio, Oh Roamio!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!