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You should have a personal recovery key for FileVault
If you have forgotten you FileVault password you can recover your encrypted data with a recovery key, but there was no recovery key created. You should immediately create a recovery key.
How to fix it
macOS 10.11 – 14
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Open terminal.app
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Enter and press return:
sudo fdesetup changerecovery -personal -
Enter the administrator password
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Enter your password (both are on most single user Mac the same)
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Write down the recovery key (write it on paper or an other location, but not on your Mac)
Example Output:
Password: Enter your password: New personal recovery key = 'GKF2-BXMK-WUEJ-JT76-J7ZK-47MO'

