Download macOS High Sierra (or another version) from the Mac App Store. Apple itself maintains a list of older software, which you can find via the official Apple Support download page. This is system software for your older Mac, but you will also find security updates and older versions of QuickTime, Safari, iMovie, Pages, Keynote and the like.
This link will install the High sierra installer in your Mac. Once the installer has been downloaded, plug in the USB in your Mac. In this USB, place the high sierra installer file. You should empty up the USB drive because MacOS will reformat it. Once the USB drive has been reformatted, change the name of the USB to “High sierra”. Step 1 How to create a bootable USB drive. If you're currently running macOS Mojave, click this link to find the Mojave installer in the App Store. For Catalina, click here. For all earlier versions of macOS, launch the App Store on your Mac, and search for the macOS version you want (this option is only available when running macOS High Sierra.
It does not matter whether you use macOS or Windows 10. It’s just a matter of time until your device will refuse to start, which could happen for many reasons, including (and not limited to) file corruption, hardware failure, and buggy update. If the unexpected happens with an Apple computer, you can use a macOS bootable USB with the installation media to repair it.
Create bootable USB installer: (With gibMacOS) Running gibMacOS, then download the version you prefer (gibMacOS script is allowed to download macOS images on all OS platforms with Python installed). Finding and running InstallAssistant.pkg under the path macOS Downloads. How To Create Bootable USB For Mac OS Sierra on Windows; Create macOS High Sierra Bootable USB. Download the latest version of macOS High Sierra operating system from App store or Techsprobe.com. Download Unibeast for macOS High Sierra from tonymacx86. Before going to download you need to create an account on TonyMacx86 after. Create a bootable USB drive for macOS X versions including El Capitan, Yosemite, Mavericks, Sierra, High Sierra, Mojave, Catalina and Big Sur.
This is one of the main reasons you should consider making a macOS bootable USB when your device is working properly. However, if none of your devices (MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, or Mac Mini) aren’t working when you need them the most, then you can use a PC to rescue your Apple device. You can use a Windows 10, Windows 8.1, or Windows 7 device to quickly create a USB bootable installation media to reinstall macOS Catalina or Big Sur on your Mac.
In this guide, you’ll learn the steps to create a macOS Catalina bootable USB installation on Windows 10, which you can use to reinstall or upgrade the Apple OS.
Before proceeding, you’ll need the following:
- Broken Mac computer running macOS (version 10.12, 11, or later).
- A trial copy of the TransMac software.
- One high-quality USB flash drive with 16GB of storage.
- Copy of macOS (DMG file).
Create macOS bootable USB installation media
Create Macos High Sierra Bootable Usb Installer
To create a bootable USB drive with macOS, use these steps:
Download and install TransMac on the Windows 10 device.Quick note: This is a paid software, but it gives you a 15-day trial, which is more than enough time. (If this works for you and you want to support the developer, you can purchase the full version.)
Connect the USB flash drive. (If you have any data on the flash drive, remember to make a backup, as everything on it will be erased.)
Right-click the TransMac app and select the Run as administrator option.
Click the Run button. (If you’re using the trial version, wait 15 seconds.)
Right-click the USB flash drive, select the Format Disk for Mac option from the left navigation pane.Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. If this is the case, the chances are that it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac.
Click the Yes button to format the drive on the warning message.
Confirm a name for the drive. For example, “macOS bootable USB.”
Click the OK button.
Click the Yes button.
Click the OK button.
Right-click the USB flash drive and select the Restore with Disk Image option from the left navigation pane.
Click the Yes button to confirm the erase of the USB flash drive data.
Click the browse button on the right.
Select the .dmg file with the macOS installation files.
Click the Open button.
Click the OK button.
Click the Yes button.
Create Mac Os High Sierra Bootable Usb
Once you complete the steps, you can now insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest macOS version, which can be Sierra, Catalina, Big Sur, or higher.
Create a GPT partition on USB flash drive
If the USB flash drive is not working with TransMac, it could still be a partition problem. In this case, you may need to redo the entire process again. However, this time you should use the following steps to use the Diskpart command-line utility on Windows 10 to create the appropriate GPT partition, and then follow the above instructions.
To create a GPT partition on a removable drive, use these steps:
How To Create Macos High Sierra Bootable Usb
Search for Command Prompt, right-click the top result, and select the Run as an administrator option.
diskpartcommand and press Enter.
list diskcommand to view all drives connected to your computer and press Enter.
select diskcommand followed the number assigned for the USB flash drive (for example,
select disk 4), and press Enter.
cleancommand and press Enter.
convert GPTcommand and press Enter.
create partition primarycommand and press Enter to complete the process.
Create Macos High Sierra Bootable Usb Installer On Windows 10
Once you formatted the USB flash drive with a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time skip steps No. 5 through 10 and continue on step 11.
Create Macos High Sierra Bootable Usb
After the process completes, which can take up to an hour, connect the USB flash drive and power on your Mac holding down the Option key, select the USB drive to begin installing macOS.
How To Create Macos High Sierra Bootable Usb On Mac
If you have problems creating the bootable media, you can get a USB flash drive that comes with macOS Sierra, El Capitan, Catalina, etc., on it with the link mentioned below. (I haven’t tried it personally, but it’s worth the try if nothing works.)
If a new version of macOS becomes available, there are a lot of people who are considering a clean installation, a so-called clean install. This can come in handy when you restore the Mac factory settings. You make a fresh start on your Mac, without taking all the previous problems and it also comes in handy if you have taken over a Mac from someone else and want to start with a clean Mac. In this case we use High Sierra.
Macos High Sierra Usb Installer
Note: make sure that you always have a backup of all your files and data should something go wrong! You can do this, for example, via a Time Machine or another external hard drive.
Clean Mac installation
High Sierra is the latest version of macOS (at time of writing). If you want to install this or all of the following updates, you can simply do so from the Mac App Store. In addition, all user data is retained. The big advantage is that you do not have to worry about it: you just have to press a button and have some patience. But you also include all the junk from previous installations. If you want to start over with a clean Mac, you have to reset the Mac factory settings and perform a clean installation. In doing so, the complete content of your disks is deleted.
macOS clean installation from a USB stick
Before you get started, you will first need to install a version of macOS on a separate USB stick. You need a USB stick with at least 16GB of storage.
Download macOS High Sierra (or another version) from the Mac App Store. Apple itself maintains a list of older software, which you can find via the official Apple Support download page. This is system software for your older Mac, but you will also find security updates and older versions of QuickTime, Safari, iMovie, Pages, Keynote and the like. Click Load more results repeatedly to see older software.Click here to go to the Official download page at Apple Support.
After the download is complete, you must disable the installation screen that appears, to prevent the installation from starting. Insert the USB stick into your Mac and give it a logical name, for example ‘macinstallation’. It is important that no special characters are allowed in it. Start the program Terminal via Programs – Utilities – Terminal or search for it in Launchpad. Enter the command below in Terminal.
Note that the word behind Volumes must be exactly the same as the name of the USB stick. The path can also be different if you want to install a different version of macOS.
Perform clean installation
Installing a clean installation of macOS is the next step in the process. Carefully follow the steps below, so nothing can go wrong. Insert the USB stick with the installer in your Mac and restart it with the Alt / Optn key pressed. The macOS Startup Manager will pop up with all bootable drives and devices that are connected. Select the USB stick that you had prepared for the installation and press Enter. The Mac will now boot from the installer on the USB stick. This can take a few minutes, depending on the speed of the USB port and the USB stick. Once this is done, the Mac will return to the macOS Utility startup window. You get a number of options there, such as Restoring a Time Machine backup. Choose Disk Utility. In the following steps your startup disk will be completely erased, so you can start with a clean slate. Select the desired startup disk. This is usually Macintosh HD.
Then click Clear to delete the entire disk. Also make sure that the format is set to macOS Advanced (Journaled). The Disk Utility now deletes the entire disk. Once this is done, you can close this program. After this you will return to macOS Utility. Now select Install macOS and the installation of High Sierra will now take place. During the installation process, choose the correct drive you just deleted, such as Macintosh HD.
Macos High Sierra Usb
After these last steps you will be guided through the standard macOS installation procedure. Once everything has gone well, you have a completely clean Mac with the latest version of macOS. Of course you do not lose everything. When you log in with your Apple ID, all personal details such as calendars and e-mails are synchronized with iCloud.