
Now, you can connect your USB to your broken Mac computer and install the new macOS. When it shows “Burning Completed”, means you’ve successfully created a macOS installer. Step 3. It will take about 10 minutes to finish the burning process, please wait it to be completed, and don’t disconnect your USB drive during the burning. To create a macOS bootable USB drive, you need to select ‘BURN’ option and browse your local DMG file, then connect your USB flash to your computer.
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First of all, you need to download and install UltraDMG on your Mac or windows computer, then launch it. It supports burning 5+ image file to USB flash drive or DVD/CD, including DMG, Bin, Img and Raw and support the latest macOS monterey and big sur. UltraMDG from SYSGeeker is an easy-to-use application helping you to create a bootable USB installer from macOS without clicks, no command required and risk free. Third Method – Create macOS Bootable USB Installer using SYSGeeker UltraDMG


File -> open -> select your dmg/iso file.Finish!: Congratulations! Now you have a bootable USB media… please if it won’t work by selecting F12 at boot prompt, modify the BIOS to boot the USB before everything!.Start: Click on Start and wait until it finishes ( for 4.5 GB it takes about 3/5 minutes….).Device: Select your device to install it on.Bootabling : Click on Open and select your DMG or ISO file then click on tools->Create a bootable USB.

