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These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

What you need to create a bootable installer

I found a nice tutorial for creating a multiboot usb thumbdrive via Linux that will boot OS X on a Mac, and Linux or Windows on PCs or Macs, and obviously, if I already have a Linux virtual machine, I could use YUMI as indicated in the tutorial (and I have seen other, similar tutorials that use a similar utilities to do this from Windows like.

• If that doesn't suit you, our users have ranked more than 25 alternatives to YUMI and eight of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to YUMI are UNetbootin (Free, Open Source), ROSA Image Writer (Free, Open Source), Deepin Boot Maker (Free, Open Source) and Raspberry Pi.
• Tryed YUMI with mac blend of the ISO and it produces a disc that is recognized by rEFInd but that gives 'Missing Operating System' when trying to load it. Unetbootin tool works on OS X, Linux or Windows BUT it will not create USB disks that will work on Macs.

• A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14 GB of available storage
• A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra or El Capitan

Download macOS

• Download: macOS Big Sur, macOS Catalina, macOS Mojave or macOS High Sierra
  These will be downloaded to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
• Download: OS X El Capitan
  This will be downloaded as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It will install an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

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* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.

After typing the command:

1. Press Return to enter the command.
2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
4. After the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
5. When Terminal says that it's been completed, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.
   

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
3. Select the volume containing the bootable installer, then click Continue.
4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
3. Release the Option key when you see a dark screen showing your bootable volumes.
4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
   If you can't start up from the bootable installer, make sure the External Boot setting in Startup Security Utility is set to allow booting from external media.
5. Choose your language, if prompted.
6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

For information about the createinstallmedia command and the arguments you can use with it, make sure the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

Creating a bootable USB drive is fairly easy. However, with most programs currently available, you can only add one ISO file. With YUMI or Your Universal Multiboot Installer, you can create multiple bootable ISOs on a USB flash drive. Therefore, this will allow you to load several Linux distros on a single drive for testing. Let’s check out how we can create a multiboot USB for Windows using YUMI multiboot USB creator tool.

Moreover, you can also load anti-virus utilities, recovery software, diagnostic tools, and other bootable software. Hence, you can use this to recover your system or clone a disk as well. Fortunately, YUMI is an easy tool to use and gets the job done quickly. Moreover, if you’re looking for a Linux distro, check out the top 5 Linux distros you must use. You can use YUMI to extract all 5 distros ISOs and test them without installing them on your PC. So if that sounds interesting, follow the guide below to create multiple bootable ISO files with YUMI.

Steps to use YUMI to create multiboot USB

Download YUMI Multiboot USB creator. There are two versions of YUMI to download — the legacy YUMI tool and YUMI UEFI. It’s worth noting that the UEFI version uses GRUB2 for both UEFI and BIOS booting. And only supports Fat32 format to boot. However, the BIOS mode can work even with a USB drive that is NTFS formatted. So download the version based on your BIOS settings. Of course, it would be a bonus if you know how to change the BIOS settings.

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Note: Backup the files on your USB drive before beginning the process. YUMI will erase and format the flash drive.

Finally, follow the steps given below to create a multiboot USB for Windows using YUMI.

1. Plug into your USB drive to your PC (preferably with more than 16GB storage).
2. Launch the YUMI.exe program on your Windows PC.
   
3. Click on I Agree to enter the application.
4. The first step is to select the USB drive. Simply click on the drop-down menu and select your USB drive. Make sure to select the correct flash drive to prevent data loss.
   
5. In step 2, select the tool or OS you want to add to the USB drive. We have used the Manjaro Linux distribution here.
6. At the third step, click on Browse and navigate to the directory of the ISO file and then select the file.
7. Once you’ve selected the correct ISO file, tap on Create.
8. Wait for the tool to extract the ISO file and then click on add more to add another ISO file.

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After the process is finished, click on Done and exit YUMI. That’s it. You can now boot from your USB drive with the Linux distributions or system tools you selected. An important thing to remember is to disable Secure Boot if you used the YUMI UEFI version. Moreover, the UEFI version isn’t backward compatible with the standard YUMI application. Nonetheless, if you followed the steps above, you should not face any issues during the process.

Yumi Boot Usb For Mac Download

Having created a multiboot USB, you should also install Ubuntu on Windows 10 to enjoy dual boot.