Generally if you have a 2010+ Intel Mac you can usually use Internet Recovery Mode (Command + Option + R) to boot to the latest online macOS installer that is supported on your Mac. For an M1 Mac, you should not erase the whole physical drive because some volumes/partitions on the drive are required for the M1 Mac to boot (Apple has special instructions or you can "Restore" the firmware to wipe out everything).Ī clean install of macOS will launch the Setup Assistant which will walk you through setting up the computer with your own user account and some other settings. This is even more important for preowned Macs because a clean install will alert you to whether the Mac has a firmware lock enabled and/or is still being managed by the previous owner (both are bad things since you will have no way of disabling either one since you will be unable to prove to Apple that you are the legitimate owner). This will destroy all data on the drive and provide you with a factory fresh OS. When acquiring a used computer it is always recommended to perform a clean install of the OS by first erasing the whole physical drive before installing the OS. Make sure you have your data backed up so you don't lose any important files. Trial run too, may be necessary re-make backups before you change anything. Once you have two admin accounts, it may be easier to change one name to see what After you have administrative access to your Mac, you can reset yourįorgotten password and then log out and log back in with your regular account." It also doesn't contain any data beyond what macOS adds when the account "A spare admin user account hasn't had changes made to its preference files.
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