Wait until the Startup Manager pops up, then select the 'OS X Base System' volume. What you need to create a bootable installer Install El Capitan On External Usb Drive Alternatively, you can just hold down the C key while starting up to boot directly into the USB drive.
Enterprise administrators, please download from Apple, not a locally hosted software-update server. This downloads as a disk image named InstallMacOSX.dmg. 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. Type or paste one of the following commands in Terminal.Open Terminal, which is in the Utilities folder of your Applications folder.Connect the USB flash drive or other volume that you're using for the bootable installer.Use the 'createinstallmedia' command in Terminal You will create the bootable installer from this app, not from the disk image or. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Mojave:* Install El Capitan Without Usb Install El Capitan On External Usb Drive If it has a different name, replace MyVolume in these commands with the name of your volume.
* If your Mac is using macOS Sierra or earlier, include the -applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.
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