How can I restore macOS
How can I restore macOS
Welcome to the Apple Support Communities.
Follow these steps for an Intel Mac:
Erasing your Mac erases all data, so if you want to preserve it, you need to create a backup. If you do not already have a Time Machine backup drive, here’s an excellent one sold by Apple: G-Technology 4TB G-DRIVE mobile USB-C Portable Hard Drive - Apple. You can then follow the steps in this Apple Support article to setup your Time Machine backup: Back up your Mac with Time Machine - Apple Support. After a successful backup, you can erase your Mac.
Shut down your Mac, then startup into Internet Recovery Mode (Option-Command-R) by immediately pressing and holding those keys at startup. Then, Use Disk Utility to erase an Intel-based Mac - Apple Support. After erasing your startup disk, reinstall macOS: How to reinstall macOS - Apple Support.
After erasing, you can restore from your backup if you wish: Restore items backed up with Time Machine on Mac - Apple Support.
Follow these steps for an Apple Silicon Mac:
Erasing your Mac erases all data, so if you want to preserve it, you need to create a backup. If you do not already have a Time Machine backup drive, here’s an excellent one sold by Apple: G-Technology 4TB G-DRIVE mobile USB-C Portable Hard Drive - Apple. You can then follow the steps in this Apple Support article to setup your Time Machine backup: Back up your Mac with Time Machine - Apple Support. After a successful backup, you can erase your Mac.
To erase your Mac, simply follow these steps: Erase all content and settings on Mac - Apple Support.
After erasing, you can restore from your backup if you wish: Restore items backed up with Time Machine on Mac - Apple Support.
If you are preparing your Mac to be given away, sold, or traded in:
See: What to do before you sell, give away, or trade in your Mac - Apple Support.
Jack