
Launch Disk Utility and erase the hard drive, if available 4. Enter your administrator password if necessary 3. To reinstall the operating system from recovery mode, follow the step by step: Important: Before performing any of these actions, you must back up all important data. When reinstalling, you have two options: you can either reinstall over the current operating system or erase the hard drive to start all over again. For example, your Mac might not be booting or you might not have been able to fix a system crash. Some Mac issues require a complete reinstallation of macOS to resolve. If you are unable to regain access to your administrator account, you may need to erase the recovery disk from the Internet or another boot volume.

Follow the instructions.īased on the method you choose when enabling FileVault, you will be given the option to reset the password using your Apple ID or recovery key. If you forgot your FileVault password, you can use recovery mode to reset it.

There is a lot to explore in this mode besides the function of reinstalling the operating system (macOS).
