How to Reinstall macOS: A Step-by-Step Guide

There are several ways to reinstall macOS. The easiest method is to use Recovery mode. Before installation, make sure that the OS version is compatible, connect the device to a power source, and check the stability of your internet connection. You need to: 

1. Create a backup manually or with Time Machine. 
2. Turn off the device. 
3. Boot into Recovery mode. 
4. Click “Reinstall macOS” and follow the on-screen instructions. 

If you do not want to spend time installing macOS, contact the authorized iSupport service center in Yerevan: we will do everything for you. 

What Is macOS Reinstallation? 

Reinstalling macOS essentially means replacing the system files on the device. It is necessary to fix software errors and failures. It is also used when a Mac does not boot for no apparent reason. There are several ways to work with the OS: 

• updating — installs the latest version through the interface of the running system without data loss; 

• in-place reinstallation — adds missing files or replaces damaged ones without formatting the drive; 

• formatting (clean macOS installation) — completely erases the storage. 

Recovery is available through the built-in Recovery environment. You return to the most recently installed version of the OS. 

Preparing Before Reinstalling macOS 

Before reinstalling macOS, you need to prepare the device. The instructions are simple: 

• create a backup in case of a failure. You can transfer the information to the cloud or use the Time Machine feature in Settings; 

• check whether the system version is compatible. For example, Intel-based devices will no longer receive the new macOS 27 version this autumn; 

• check the internet connection. Wi-Fi will work, but a wired connection is preferable; 

• make sure that you have access to your Apple Account and that your passwords and keys are saved; 

• deactivate Find My and sign out of cloud storage if you plan to sell the device later; 

• download the installer from the App Store (optional); 

• prepare a bootable USB drive if you are not using Recovery. 

All of this takes time, but it helps protect against errors. 

Ways to Reinstall macOS 

You can reinstall macOS in different ways. One of the easiest is to use the Recovery tool. Let us look at the other options. 

Recovery is often chosen. Your device will download the recovery data itself. 

Step-by-Step Instructions for Reinstalling the OS on a MacBook via Recovery 

1. Reinstalling the OS through Recovery is not difficult. What to do: 

• Turn off the Mac and wait until it shuts down completely. If it freezes, force it to shut down. 

• Start Recovery mode. For models with an M-series chip, hold down the power button, then select “Options” and “Continue.” For devices with an Intel processor, press the power button and then hold Command + R. 

• Select an account and enter the password. 

• Find “Reinstall macOS” and click “Continue.” If you plan to completely erase the device, first open “Disk Utility.” 

• Select the drive where you plan to install the OS. 

• Do not touch the device until the process is complete. 

You can install the OS from an external drive. However, you first need to write the distribution package to a USB flash drive. Then follow the standard instructions. 

How to Check macOS After Reinstallation? 

After installation, check that all data has been restored and the system is working properly. If you formatted the drive, you can restore files and settings using Migration Assistant, Time Machine, or manual copying. If the settings have been reset, be sure to check whether the following features work: 

• “Optimized Battery Charging”; 

• “Find My”; 

• “Firewall”; 

• “Background disk encryption”. 

After reinstallation, go to “Software Update” through System Settings and enable automatic updates. Install available apps in the “Updates” section of the App Store. Check the hardware using Apple Diagnostics. 

Common macOS Reinstallation Errors and How to Fix Them 

Problems may sometimes occur while reinstalling the OS. If Recovery mode does not load, check whether you are pressing the correct keys. Issues may also arise because of a poor internet connection, in which case it is better to connect to the network with a cable. 

If the installer reports insufficient space, delete large files. If the problem is caused by installer incompatibility, it is better to restart the device in Recovery mode. Another common issue is freezing on the Apple logo. In this case, you need to force restart the device. 

If you want a fully working device and do not want to deal with the details, you can contact an authorized service center. iSupport is located at 9 Tumanyan Street in Yerevan. Our experts are trained according to Apple standards and are always ready to help you reinstall the operating system. 

FAQ 

What Are the Specifics of Reinstalling macOS on a MacBook With Apple Silicon? 

The OS is usually reinstalled through Recovery mode: completely turn off the device, then press and hold the power button until the startup options appear. This installs the current version. 

How Do You Reinstall macOS on Older Macs With Intel Processors? 

The Command + R key combination launches the built-in recovery feature. The Option + Command + R combination starts Internet Recovery. Follow the on-screen instructions. 

Can You Reinstall macOS Without a USB Flash Drive? 

Yes, simply use Recovery. Follow the instructions that appear on the display. 

How Long Does It Take to Reinstall macOS? 

The process takes place in two stages. Downloading the data usually takes 30–60 minutes, while the installation itself takes 20–45 minutes. 

How Do You Install macOS From Scratch on a Clean Drive? 

Start the Mac in Recovery mode, open “Disk Utility,” and erase the main drive. Return to the menu and select reinstallation. 

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