![]() If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu > Startup Disk.Select ”Allow booting from external media.”.Step 2b: Get the install file for an older version of macOS.Īs many you asked, how do I get my Macbook Air to boot from USB?.Once the USB drive has booted, select Disk Utility from the Utilities window, choose your Mac’s startup drive from the list, and click Erase.Īlso, how do I do a clean install of OSX from USB? Similarly, how do I install OSX Catalina on Macbook Air from USB? Use the mouse pointer or the arrow keys on your keyboard to select the disk called Install macOS Catalina in the drive list that appears on the screen. Once you have your bootable installer ready, it’s time to move to the next step. On a MacBook or Mac desktop computer, download the version of macOS that suits your needs. Is Catalina compatible with MacBook Air?.Can I make a Windows bootable USB on Mac?.How do I get to the boot menu on a Macbook Air?.How do I know if my Mac USB is bootable?.How do I install macOS High Sierra from USB?.How do you make sure your Mac is backed up?.
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