hdiutil convert /path/to/input.dmg -format UDTO -o /path/to/output.iso
Below is a comprehensive guide on how to achieve this. This guide assumes you have already acquired the macOS .dmg file and a USB drive (at least 16GB recommended).
Before you begin, make sure you have the following: create mac os x bootable usb installer from dmg
This guide will walk you through the entire process, from downloading the necessary files to using the terminal to create the bootable drive. Prerequisites Before beginning, ensure you have the following:
Before starting the flashing process, gather the following necessary components: hdiutil convert /path/to/input
A DMG is just a container. Double-click it in Finder. Inside, you will likely find one crucial item: Install macOS [Version Name].app .
Select the root name of your USB drive from the left sidebar. Click the button in the top toolbar. Configure the erasure settings as follows: Select the root name of your USB drive from the left sidebar
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Use code with caution.
(Adjust the app name to match your macOS version)
Apple does not typically use DMGs for its bootable tool; instead, it uses the file located in your Applications folder. How to convert DMG to Mac OS X app installer
This installer package does not install the OS on your computer; instead, it extracts the actual application (e.g., Install OS X El Capitan.app ) directly into your folder. Step 3: Use the Native Terminal createinstallmedia Tool