Run resetpassword, which opens the Reset Password application.None of them can be used if FileVault 2 is enabled and you don't know the password though.) Using Reset Password.app on the recovery partition (I also copied and pasted instructions for three ways to reset the password of an account below. If you can't get the recovery key from Apple and you can't contact the previous owner, your only option might be to replace the hard drive. You need to provide these pieces of information in order for AppleCare to retrieve your recovery key.
#Reset password on macbook pro 2018 serial number#
Click the triangle-button next to the prompt that appears to reveal a Recovery Key text field (which replaces the password text field) and AppleCare contact information, along with your computer's Serial Number and a Record Number. Typing in the wrong login password three times prompts you if you have the ability to retreive your key from Apple. If the previous owner enabled the option to store the recovery key with Apple, you might be able to retrieve the recovery key by contacting Apple support: When I tried selecting Reinstall OS X, the list of volumes did not include the Macintosh HD volume. When I enabled FileVault on a VM and started up from the recovery partition, the erase tab was missing from Disk Utility, and I couldn't create another partition from Disk Utility. If FileVault is enabled, I don't think there is any way to erase and reinstall OS X without knowing the password or the encryption key. If FileVault 2 is enabled, you can't use the Reset Password application to reset the password of an account either. You don't normally have to enter a password to start up in single user mode, but if FileVault 2 is enabled, you do. The Mac was probably encrypted with FileVault 2.
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