OS X 10.7 Lion: Reset master password to FileVault 2 I need to reset or delete my master password to FileVault 2. This is the password found under System Preferences > Users &amp; Groups > Service gear > Change Master Password. It's a backup in case a user forgets his or her account password.

(I accidentally set said password before writing it down in an awkward keyboard fumble.)
It's surprisingly simple.


Delete /Library/Keychains/FileVaultMaster.keychain
Delete /Library/Keychains/FileVaultMaster.cer


When you return to set a new password your old one will have been cleared.

Based on step 4 in How to create and deploy a recovery key for FileVault 2.