This is why it’s recommended that you make a Mac OS X bootable USB when your Mac is in working conditions. However, if you find yourself in a scenario where your device (iMac, MacBook Pro, Air, Mac Pro, or Mini) is not responding, and you happen to have a Windows 10 device, then you can still be able to make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant. These instructions will also work for Windows users running Mac OS X on a virtual machine and needing to upgrade to the latest version.
Requirements
Before you dive into this guide, you’ll need a few things:
A broken Mac computer with Mac OS X. A trial copy of the TransMac software. One high-quality USB flash drive with 16GB of storage. A copy of Apple’s macOS (DMG file).
Now that you have all the necessary ingredients, you’re ready to make a Mac OS X bootable USB using the DMG file of the operating system with the steps below.
Create Mac OS X bootable USB installation media
Before using TransMac, you first need to partition your USB flash drive with a GPT partition, as a normal MBR partition may not work. To do this, you’ll need to use the Diskpart command-line utility on Windows 10.
Setting up GPT partition
Use these steps to set up a USB drive with a GPT partition: After you complete the steps, the USB flash drive from MBR to GPT format, you can use the steps below to create a bootable USB installation media to install Mac OS X. Creating a GPT partition to build a Mac OS X bootable drive on Windows 10
Create USB install media
Use these steps to create a bootable media to install Mac OS X: Once your bootable USB installation media is ready, remove it and insert it into your Mac, power it on, hold down the Option key, and select the USB you just created to reinstall Mac OS X.
Now, you’ll have to wait a long time. No kidding. Depending on your computer and other variables, it could take one or two hours to complete the process.
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