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 version of macOS, which can be Sierra, Catalina, or later. Click the browse button on the right, locate the. On the warning message, click the Yes button to confirm the data on the USB drive will be erased. If the formatting completed successfully, click the OK button. If you have any data on the USB, remember to make a backup, as everything on it will be erased.Ĭlick the Yes button. Connect the USB flash drive you want to use to fix your Mac. This is one of the main reasons why you should always consider making a macOS bootable USB when your device is working properly. If the unexpected happens with an Apple computer, you can use a macOS bootable USB with the installation media to repair it.
