Launch the Disk Maker installer and copy the app to your Applications folder.Download the macOS you want for your bootable USB and save it in your Applications folder.Choose which OS version you’d like to use. To create one, follow the instructions below: You’ll need to first download an app and have a USB drive with a minimum of 8GB of space. If you have issues with your Mac, this handy device can save a lot of time. Having a USB that you can boot from and reinstall your macOS is well worth the time it takes to make one. However, you’ll first need to create the backup. Installing macOS with a bootable USB doesn’t require having an internet connection. Once the process ends, your Mac will reboot and your new OS will be operating.Select your main drive to install the macOS from your USB.Once completed, close the Disc Utility window and choose “Install OS X.”.From the popup window, for “Format,” select “OS X Extended (Journaled)” and hit “Erase.” This will erase your main drive.Tap your Mac’s main hard drive, click “First Aid” and then “Erase.”. After it restarts, select the USB and choose “Disk Utility.”.Hold down the “Option” key and restart your Mac.If you’re having issues with your Mac booting properly, this should solve the problem. Please note that using this method will erase everything currently on your Mac’s hard drive. Once the process finishes, your Mac will automatically reboot.Īnother way to install macOS from a USB is to use the Disk Utility method.The OS will install from your bootable USB.Select “Install macOS” and hit “Continue.”.When your Mac displays the Startup Manager, click on the external drive USB that you plugged in.Start your Mac and hold down the “Option/Alt” key to place it in recovery mode.Using this method can save you from the headaches of trying to diagnose the problem. If you’re having issues with your Mac, one solution is to reinstall the macOS using a bootable USB. In this article, we’ll cover how to install macOS from a USB using several methods.
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