4

This is not the user or admin login password. Running OS X Yosemite 10.10.5.

To set or change the Master Password first click on the gear (1) and a new dialog box will open (2)

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  • Do you have a recovery key? – Tetsujin Sep 24 '15 at 15:00
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The Master Password is more a safety net than a security measure.

Without any user password you may reset or delete the Master Password by booting to your Recovery HD, starting Terminal, mounting your main volume, navigating to /Library/Keychains and deleting the files FileVaultMaster.cer and FileVaultMaster.keychain.

If your main volume is encrypted you won't be able to mount it without a proper FileVault password.

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  • Once the two files are deleted, will I be able to set a new Master PW. Also, will deleting the Keychain File have an effect on my other Apple devices i.e. Phones, ipads – Dan Thompson Sep 30 '15 at 0:17

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