How to create a macOS bootable USB on Windows in easy way.

Requirements:

  • A broken Mac computer with Mac OS X or macOS Sierra (version 10.12 or later).
  • 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).

How to make a macOS bootable USB installation media

Use these steps to create a bootable USB drive with the latest version of macOS:

  1. Download and install TransMac on your Windows PC. 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 want to support the developer, you can purchase the full version.)
  2. Connect the USB flash drive you want to use to fix your Mac. If you have any data on the USB, remember to make a backup, as everything on it will be erased.
  3. Right-click TransMac, and select Run as administrator.
  4. If you’re using the trial version, wait 15 seconds, and click Run.
  5. On the left, right-click the USB flash drive, select Format Disk for Mac. 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, chances are that it’s using a MBR partition, and the USB drive needs a GPT partition to work on a Mac.
  6. On the warning message, click Yes to format the drive.
  7. Enter a name for the drive, such as “macOS bootable USB” and click OK.
  8. Click Yes to confirm.
  9. If the formatting completed successfully, click OK to continue.
  10. Right-click the USB flash drive, and select Restore with Disk Image.
  11. On the warning message, click Yes to confirm the data on the USB drive will be erased.
  12. Click the browse button on the right, locate the .dmg file with the macOS installation files.
  13. Click Open.
  14. Click OK.
  15. Click Yes to create the macOS USB bootable media.

Once the process completes, you can now insert the USB flash drive on your Mac computer to install, reinstall, or upgrade the operating system to the latest version of macOS, which can be Sierra or later.

How to create a GPT partition on a USB flash drive

If the USB flash drive is not working using TransMac, it could be still a partition problem. In this case, you want to redo the entire process again, but this time use the following steps to use the Diskpart command-line utility on Windows to create the appropriate GPT partition.

Use these steps to create a GPT partition on a removable drive:

  1. Open Start.
  2. Search for Command Prompt, right-click the top result and select the Run as an administrator option.
  3. Type the diskpart command and press Enter.
  4. Enter the list disk command to view all drives connected to your computer and press Enter.
  5. Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter.
  6. Enter the clean command and press Enter.
  7. Type the convert GPT command and press Enter.
  8. Enter the create partition primary command and press Enter to complete the process.

Once you formatted the USB flash drive to a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time skip the steps 5 through 9, and continue on step 10.

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 the installation of macOS.

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