Here's how you can create a macOS Big Sur beta USB installer disk for clean installation on your Mac. It turns out that macOS Big Sur is available to download as an installer application, and from that you can build a macOS Big Sur DMG file, and that's what we'll show you how. There are 2-ways to download macOS Big Sur from Apple Some Mac users may be interested in obtaining macOS Big Sur as a DMG file, so that they can use the disk image with a virtual machine, to create bootable media, for archival purposes, for cloning, or any other reason. Download macOS Big Sur From Apple Create & Mount an empty Disk Image using hdiutil Use the Createinstallmedia command to make the disk image bootable with macOS Unmount the Disk Image Covert the Disk Image to ISO image #1.1. Launch Disk Utility and Erase your drive and make sure you name it 'Untitled.' Do not change the currently set parameters. Download macOS Big Sur Beta on Your Mac Step 4.
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