I have problems with my startup volume, and it's encrypted with FileVault. I don't remember the pasword, but have the recovery key. Is it possible to reset the password?
MacOS – Is it possible to reset FileVault password in recovery mode
encryptionfilevaultmacosstartup
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Best Answer
If you have the recovery key (assuming it's the alphanumeric kind), you can reset your account password in the following way:
Your Mac should boot and stop at the OS's login window.
If your Mac isn't able to boot from its regular boot drive and you can only start from the recovery drive, you should unlock and then decrypt your Mac prior to trying to fix your Mac. I have a post available here showing how to unlock and decrypt your Mac using your recovery key:
Unlock or decrypt your FileVault 2-encrypted boot drive from the command line