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21 Février 2021
Follow the below process to boot your Mac from bootable USB: Insert the bootable USB installer drive and go to 'Apple Menu Restart'. When your Mac restarts, press and hold the Option key till 'Startup Manager' opens. The Startup Manager scans and lists the drives that are connected and bootable. Jul 31, 2018 Way 1: Boot Mac from USB Drive using Startup Manager. Getting your Mac to load from a USB drive is fairly straightforward. Use the following steps, you can easily set Mac boot from an external drive in Startup Manager, so it'll only boot from USB that one time. Step 1: Insert the USB boot media into a USB slot. Step 2: Turn on your Mac (or. Make a Bootable USB Stick In the Mac App Store, download the operating system installer. To quit the installer if it tries opening automatically, hit the 'ESC' key on your keyboard. The installer is in the Applications folder. You can also click on Launchpad and see it listed in there as well.
These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Find the appropriate download link in the upgrade instructions for each macOS version: How do you play sims on a macbook air.
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
MyVolume in these commands with the name of your volume.Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created. * If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.

After creating the bootable installer, follow these steps to use it:

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Catalina:
Mojave: Macbook air 2008 os.
High Sierra: All game support software for pc.
El Capitan: