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 (PLS, sold)
TiVo HD 1TB (157 HD Hrs, PLS, "652")
Juliet Basic (PLS)
OTA! OTA! OTA!
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!