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How to Clean Install macOS Sequoia on your Mac

The following is a guide for installing macOS Sequoia on your Mac. You can use this guide for a clean install of macOS Sequoia on your compatible Mac.

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Clean install macOS Sequoia using Bootable USB Drive

Overview


Today, Apple announced their new macOS lineup i.e macOS Sequoia 15.0 which is Apple's newest and most awaited OS. Monterey added massive updates and improvements from its predecessor, Big Sur.

Packed with new features and functionality, the most noticeable update that can be seen and experienced is the new GUI. Featuring a much more "iOS" look and feel and is as smooth as butter.

Requirements


Before you start with this guide, here's are a few requirements
  • A working Internet connection.
  • A 16 GB or larger USB Flash Drive.
NOTE:
  • A complete backup of your system. We advise you to perform a complete backup of your system along with the existing installation. In case something goes wrong, you can restore it using the backup you created.

To start with the guide, you'll also need to have access to a fully functional computer running macOS Mojave or later. This requirement is must as you need to access to Mac App Store in order to download a copy of macOS and create an installation USB Flash Drive later on.

Compatibility


Before you proceed with a clean installation, we suggest you to check the compatibility of the Mac model.

Installing macOS Sequoia on Mac


Now, you can start downloading files, creating a bootable USB, and doing a clean install. Follow the steps below to install macOS Ventura on your Mac.

STEP 1: Download macOS Sequoia and Create a Bootable USB
To download macOS Sequoia and create a Bootable USB, refer to the guide linked below.

STEP 2: Booting the macOS Installer
After preparing your installation USB, you're ready to install it on your target Mac

1. Start/Restart your Mac and while starting/restarting, hold down the option (⌥) key or Alt Key (if you're using a non-Apple Keyboard) on your Keyboard. If you're using an Apple Silicon Mac, press and hold the Power button on your Mac until the startup option appears. You'll see something like this below.

View attachment 6162


2. Select Install macOS 15 beta and click on Continue or you can press enter to boot and the installer will load in a while.

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View attachment 6164

STEP 3: Installing macOS

When booted from the USB, you'll see something like below

View attachment 6165

Do not continue yet as we're performing a clean install, it would be best to erase the target disk on which you're going to install macOS Sequoia.

Quit Install macOS.

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When the installer prompts, click on Quit and the installer will go back to Recovery Menu.

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When at the Recovery Menu, select Disk Utility and click on Continue.

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3. When at Disk Utility, Click on View, and then select Show all Devices.

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4. Now select your Hard Drive or SSD on which you want to install macOS and use the following parameters to erase your drive.

Name: Macintosh HD
Format: APFS
Scheme: GUID Partition Map

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4. Once the parameter is set, click on Erase button and you should see a prompt to erase your Mac.

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Click on Erase Mac to continue erasing your Mac. When prompted, click on Erase Mac and Restart.

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Your Mac will restart and boot back to Recovery to complete the Activation.

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From the top right menu, click on the WiFi icon and connect to your WiFi Network. If you're having an Ethernet Connection, you can use it too. We're using WiFi as it's more convenient. When prompted, enter your network password and click on Join to connect to your WiFi Network.

View attachment 6180View attachment 6179


Once the network is detected, your Mac will start the Activation.

View attachment 6181


Once activated, you'll see something like below.

View attachment 6182


From the Apple Menu>Click on Shut Down

Start/Restart your Mac and while starting/restarting, hold down the option (⌥) key or Alt Key (if you're using a non-Apple Keyboard) on your Keyboard. If you're using an Apple Silicon Mac, press and hold the Power button on your Mac until the startup option appears. You'll see something like this below. You'll notice that the Disk name no longer appears now as it's erased.

View attachment 6183


Select Install macOS 15 beta and click Continue. Alternatively, press enter to boot and the installer will load in a while.

View attachment 6184


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1. When at the installation screen, select your preferred language and continue

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The installation screen will appear automatically. Click on Continue and then continue with the options.

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7. Now select Macintosh HD and click on Continue.

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Now, macOS Sequoia will begin installing to your selected disk.

View attachment 6190

NOTES:
  • This will take couple of minutes and will restart at "Less than a minute is remaining". Upon completion, the system will automatically restart. Your Mac will restart to complete the installation.

Here it ends the first phase of the installation and Your Mac will restart a couple of times.

The installer will continue the second phase of the installation. Upon completion, your Mac will automatically restart.

View attachment 6191

STEP 4: Finishing macOS Setup
After finishing the macOS installation, it's time to set up the macOS for the first usage with the newly installed macOS.

When you're at the welcome screen, continue with the basics options such as Keyboard setup, Network, Computer Account and Privacy settings.

View attachment 6192


View attachment 6193

Now the installation is complete!

Enjoy macOS Sequoia on your Mac :)

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NOTES:
  • The first boot may be slower as the caches are not built yet. Once the caches are built, it will boot normally.
 

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