Clean Install macOS Sequoia Beta: A Step-by-Step Guide

Wendy Wu
Last updated: Jun 21, 2024

Are you looking for ways to clean install macOS Sequoia beta? This comprehensive guide will walk you through each step, ensuring a smooth and efficient installation process. Read on to learn how!

Rather than upgrading to macOS Sequoia beta directly, you might prefer a clean install. A macOS clean install is a process of erasing all your previous macOS settings and content and installing the new macOS update.

Compared to upgrading directly, a clean install can make your Mac run at a higher speed with the newly installed macOS.

This post will provide a step-by-step guide on how to clean install macOS Sequoia. Let’s get started!

Clean install macOS Sequoia

How to Clean Install macOS Sequoia Beta

Before you begin, make sure your Mac is compatible with macOS Sequoia first:

macOS Sequoia compatible list

In total, there are mainly 5 vital steps for a successful macOS Sequoia clean install. Let's delve into each step.

Step 1: Back Up Your Mac

The first and most important step is to back up your Mac. Clean install macOS will erase all content and settings of your Mac. So it's essential to back up important data before you erase your current macOS.

The more files you back up, the longer it will take. Therefore, it is recommended to clean up your Mac before you make the backup to speed up the backup process. BuhoCleaner - a Mac cleaner that offers you a quick way to delete junk files and duplicate files, uninstall apps completely, etc., contributing a lot to free up your Mac space.

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For more details about back up Mac: [Full Guide] How to Back Up Mac with/without Time Machine

Step 2: Download the macOS Sequoia Beta Installer

After cleaning up and backing up your macOS, you can start to download the macOS Sequoia beta Installer.

  1. Download macOS Sequoia beta installer.
  2. Find the .pkg file in the Finder's Downloads folder and move it to the Applications folder.
  3. Double-click InstallAssistant.pkg to open it.
  4. Click Continue > Install > Enter the password > Click Install Software > Close.
    macOS Sequoia beta software installation
  5. Make sure the install software "Install macOS 15 beta" is in Finder‘s Applications folder.
    Install software macOS 15 beta
macOS Sequoia official version is expected to be released in October. macOS Sequoia installer is not available in the App Store now.

Step 3: Create a Bootable Installer

Now that you have already downloaded the macOS Sequoia beta installer, let's create a bootable installer with a USB drive.

  1. Prepare a bootable USB drive (more than 15 GB) and connect it to your Mac.
  2. Format it to macOS Extended (Journaled).
  3. Open the Terminal, then copy and paste the following command:
Replace MyVolume with the name of your USB drive.

sudo /Applications/Install\ macOS\ 15\ --volume /Volumes/MyVolume

  1. Hit the Return key.
  2. Enter the password if asked and press the Return key.
  3. Follow the on-screen instructions.

Step 4: Erase Your Mac

The final step before performing a clean install of macOS Sequoia beta is to erase your Mac.

  • For a Mac with Apple silicon or an Intel-based Mac with the Apple T2 Security Chip:
  1. Go to Apple menu > System Settings > General.
  2. Click Transfer or Reset > Erase All Content and Settings.
  3. Follow the on-screen instructions to complete this process.
Erase all content and settings
Erase All Content and Settings is only available for macOS Monterey or later.
  • For other Macs:

Start up your Mac from recovery mode and erase your startup disk with the Disk Utility according to the on-screen instructions.

Step 5: Clean Install macOS Sequoia Beta

Be patient! We've already come to the last part - clean install macOS sequoia beta. Here's what to do:

  • For Mac with Apple silicon
  1. Shut down or turn off your Mac.
  2. Connect the bootable installer to your Mac.
  3. Press and hold the Power button until you see the startup option.
  4. Click the bootable installer > Continue.
  5. Follow the on-screen instructions.
  • For Other Macs
  1. Shut down or turn off your Mac.
  2. Connect the bootable installer to your Mac.
  3. Turn on your Mac > Press and hold the Option(Alt) key until you see the bootable installer.
  4. Click your bootable installer > Click the on-screen arrow or press Return.
  5. Click Install macOS from the macOS Utility window.
  6. Click Continue and follow the on-screen instructions.
If you already installed macOS Sequoia beta before but want a clean install of it now, you can use macOS Recovery to reinstall it without USB drive.


Congratulations! You have gone through all the steps for a macOS Sequoia clean install. Go and experience the new macOS 15 Sequoia feature now!

Wendy Wu is a tech enthusiast with a deep passion for all things iPhone, iPad, and Mac. Wendy is always on the lookout for Apple products and is committed to providing Apple users with some of the latest information and useful tips.