How to reinstall Mac (macOS): clean install / factory reset


Quite often, Mac users are faced with the following problem – how to return the computer to factory settings, resetting all user information, and reinstall the operating system “clean”. Instructions for this process are presented below.

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The Mac, like most other Apple devices, is designed for personal use. This means that usually computer owners fine-tune the system for themselves and another user will not be entirely comfortable working with it. If it becomes necessary to completely get rid of the existing data and settings, then you need to follow the simple steps described below.

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Clean install macOS: preliminary steps

IMPORTANT: Before you clean install (reinstall, flash, factory reset) your Mac, be sure to check:

  • Is the Mac linked to your Apple ID and not to any other
  • Do you remember your Apple ID credentials (login and password)? You can check, for example, by logging in on this page (from a computer).

The fact is that in case the function was activated on Mac Find Mac (located along the path: System settingsiCloudFind Mac), then after reinstalling the system (resetting to factory settings), the system will ask you to enter the Apple ID to which the device is linked.

Find Mac

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How to factory reset Macbook, iMac, Mac mini, Mac Pro (how to reinstall macOS)

Boot Mac into Recovery Mode

one. Make sure you have an internet connection (to install macOS later), as well as an electrical connection in the case of a MacBook.

Attention! Further actions will lead to the complete deletion of ALL data on the Mac – save the necessary information on an external medium in advance;

2. Restart your computer (or turn it on if it was turned off) using the menu  → Restart;

3. During the reboot process, press and hold the keyboard shortcut that suits you best:

⌘Cmd + R – install the version of macOS that was running on the computer before the problems occurred. Those. your Mac will install exactly the same version as before.

⌥Option (Alt) + ⌘Cmd + R – update to the latest macOS version your Mac is compatible with. For example, if the Mac was running on High Sierra, and the breakdown occurred after the final macOS Mojave build was released, the system will download and install Mojave from the Web.

⇧Shift + ⌥Option (Alt) + ⌘Cmd + R – installation of the version of macOS that was originally installed on the computer (or the closest version available).

Note: macOS Sierra 10.12.4 or later required.

4… Then the window “MacOS Utilities “ (May be referred to as macOS Utilities on versions below macOS High Sierra). Here you need to select “Disk Utility “ and click “Proceed”;

How to reinstall macOS or restore Mac to factory settings

Checking and fixing boot disk errors (recommended)

one… Select in Disk Utility your drive in the menu on the left (usually the Macintosh HD, it’s at the very top).

2… Click on the inscription First aid

3… Click on Run… The application will check the boot disk for “health status”, ie. performance and will correct any errors. This process may take some time.

Checking and fixing boot disk errors (recommended)

4… After completing the check, press Done

Checking and fixing boot disk errors (recommended)

Erasing a boot disk

one. In the application Disk utility, select a verified boot disk, go to the section “Erase” (at the top of the screen);

How to reinstall macOS or restore Mac to factory settings

2. On the menu “Format” select APFS (for computers with macOS Sierra and older OS, select Mac OS Extended) and press “Erase “;

How to reinstall macOS or restore Mac to factory settings

How to factory reset Mac (how to reinstall macOS)
3. When the disk formatting process is complete, click “Complete” to exit Disk Utilities

Reinstalling the macOS Operating System (Factory Reset)

Reinstall macOS using the appropriate item (screenshot below) and follow the instructions. The latest version of macOS will be downloaded from the Internet and the process of reinstalling macOS will begin. During this time, the computer may restart.

Note: if you install from scratch, you will need to re-configure your Mac and programs.

How to reinstall macOS or restore Mac to factory settings

How to factory reset Mac (how to reinstall macOS)

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