Instalacion correcta?

Hola a todos estoy intentando instalar el driver para AC97 y lo hago asi, donde esta el error por que no consigo escuchar el audio.
Last login: Tue Jun 19 09:25:27 on console
Welcome to Darwin!
84:~ Juanmi$ sudo -s
Password:
84:~ root#
84:~ root# sudo -s
84:~ root# cd /System/Library/Extensions/AppleAC97Audio.kext
84:/System/Library/Extensions/AppleAC97Audio.kext root# cd /contents/Plugins/AppAC97AudioIntelICH.kext/contents
bash: cd: /contents/Plugins/AppAC97AudioIntelICH.kext/contents: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root# cd /contents/PlugIns/AppAC97AudioIntelICH.kext/contents
bash: cd: /contents/PlugIns/AppAC97AudioIntelICH.kext/contents: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod Info.plist
usage: chmod [-fv] [-R [-H | -L | -P]] [-a | +a | =a [# [ n]]] mode|entry file ...
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod 501 Info.plist
chmod: Info.plist: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod 644 Info.plist
chmod: Info.plist: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod 755 Info.plist
chmod: Info.plist: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod 755-r Info.plist
chmod: Invalid file mode: 755-r
84:/System/Library/Extensions/AppleAC97Audio.kext root# chmod 755 -R Info.plist
chmod: -R: No such file or directory
chmod: Info.plist: No such file or directory
84:/System/Library/Extensions/AppleAC97Audio.kext root#

te esta indicando que no encuentra el archivo ya lo copiaste a la carpeta /System/Library/Extensions/ ?? haslo manualmete te pedira confirmar, pones tu contraseña y listo.

Re:instalacion correcta

Hola
Segun yo no es con el comando cd si no con el nano, que te quedaria asì
sudo nano /System/Library/Extensions/driver.kext/Contents/Info.plist
Suerte !