Last Updated on May. 10, 2024 by Yasmine Lynn Comments
If your Mac suddenly won’t boot, gets stuck on the Apple logo, or needs a clean reinstall, having a macOS bootable USB installer can save you a lot of time and stress.
UltraDMG is a simple desktop tool that lets you create a macOS bootable USB on both Windows and Mac, without dealing with Terminal commands or complicated scripts. It works well with both older macOS versions (High Sierra, Mojave, Catalina) and newer ones like Tahoe. Below is a step-by-step guide based on real usage.
Step 1. Since UtlraDMG is a desktop utility, you need to first download and install it on a Windows or Mac computer (not your broken Mac), then launch it.
Step 2. If you don’t already have a macOS DMG file, UltraDMG can download one for you directly. Just open the Download macOS section, choose a save location, browse the available macOS versions, and start the download. UltraDMG will save the installer as a DMG file on your computer.
Step 3. After the macOS DMG file is ready, switch to Burn DMG in UltraDMG, load the DMG image, connect your USB drive, select it as the target device, and start burning. UltraDMG will write the installer to the USB drive and create a bootable macOS installer.
During the burning process, UltraDMG shows real-time progress information, including writing speed, completion percentage, and estimated time remaining. Please keep the USB drive connected until the process finishes to ensure the installer is created successfully.
Step 4. Finally, plug the macOS bootable USB installer into your Mac.
On Intel-based Macs, restart your Mac and immediately press and hold the Option (⌥) key until the Startup Manager appears.
On Apple Silicon Macs (M1, M2, M3), shut down the Mac first, then press and hold the Power button until the Startup Options screen appears.
Select the USB installer, then choose Install macOS from the macOS Utilities screen and click Continue. Follow the on-screen instructions to complete the installation.
As you can see, it's very easy to create a macOS bootable installer drive. After that, you can install, reinstall, or upgrade the operating system by yourself.
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