If you accidentally delete or modify a kext this method will help you restore it. The easiest way is restore from TimeMachine backup. If you do not have any backup…
- Download the Mavericks image from App Store
- Install Pacifist from CharlesSoft
- Open with Pacifist:
/Applications/Install OS X Mavericks.app/Contents/SharedSupport/OSInstall.mpkg
- Find and select Extensions folder:
Contents of OSInstall.mpkg > Contents of EssentialSystemSoftware > Contents of EssentialSystemSoftwreGroup > Contents of BaseSystemBinaries.pkg > System > Library > Extensions
- Click Extract To… button in toolbar, and give the path where you want to store the backup of original extensions.