![]() ![]() If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might. And Shift-Option-Command-R isn't available. ![]() The version of macOS offered by macOS Recovery might vary in some cases: If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. Then, restart your Mac (or, if it's currently shut down, start it up) while holding. You can boot any El Capitan-compatible Mac from your new installer drive. This should include the bootable USB flash drive you just created. After a short delay, your Mac will display the OS X Startup Manager, which will display all of your bootable devices. ![]() ![]() Restart your Mac while holding down the option key. Insert the USB flash drive containing the El Capitan installer into your Mac. Install Mac Os X El Capitan On New Hard Drive Installation You might find it easiest to begin installation in the evening so that it can complete overnight, if needed. Click Continue and follow the onscreen instructions. After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan. ![]()
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