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This tutorial will show you how to download macOS Montery, copy it to a USB Flash drive, and make it bootable. The Montery USB can be used to perform a clean installation of macOS on any Mac hardware.
Before we begin
You will need a blank USB Flash drive big enough to store the macOS installer which as of writing is (13.66 GB).
If you don’t have a spare USB Flash Drive, I recommend getting a
16 GB SanDisk Ultra Fit* because they are fast, reliable and have a micro form factor. If you’re using a Mac that doesn’t contain USB ports, you will also need an
Apple USB-C to USB Adapter*.
Now that you’ve got your hands on a USB Flash Drive and a USB-C to USB Adapter, let’s copy the macOS installer to the drive and make it bootable by following the steps below.
Step 1: Download macOS Installer
The first thing we need to do is download the macOS Installer to your Applications folder. Open the Terminal app and run the following command to download it.
When asked to erase the volume, press y then return.
Ready to start.
To continue we need to erase the volume at /Volumes/Sandisk.
If you wish to continue type (Y) then press return: y
Wait for the installer to be copied and the disk to be made bootable.
Erasing disk: 0%... 10%... 20%... 30%... 100%
Making disk bootable...
Copying to disk: 0%... 10%... 20%... 30%... 40%... 50%... 60%... 70%... 80%... 90%... 100%
Install media now available at "/Volumes/Install macOS Monterey"
That’s it. You now have a bootable macOS USB Flash drive that you can use to upgrade your Mac or perform a clean install.