How to install mac os sierra from usb11/4/2022 ![]() ![]()
The three steps to download macOS, create a bootable installer to an external USB and then clean install macOS from USB should be clear and simple to follow. When the macOS installer opens, follow the onscreen instructions. Select the volume containing the bootable installer, then click Continue. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions. Select the volume containing the bootable installer. Release the Option key when you see a dark screen showing your bootable volumes. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac. Also, the USB drive needs formatting as Mac OS Extended (HFS+). The installer creation process will format and erase all data on the external USB to take effect. ![]() If you want to use an old USB drive for installation, make sure that you've copied the data and saved it as a backup. Create the Bootable Installer After Downloadįirst of all, a vacant 16GB USB drive is essential. This download is presented in a disk image format named InstallMacOSX.dmg. OS X El Capitan is quite different from the other five. ![]() Enterprise administrators, please download from Apple, not a locally hosted software-update server. If the installer opens after downloading, quit it without continuing installation. 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. Q3: Can I install macOS from USB without the internet?Ī bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.Ĭlick the download link for the desired macOS version you want to install.Įach macOS download is going to send to the Applications folder as an app named Install macOS. You need to create the installer using correct Terminal commands for different macOS versions. Q2: How do I create a bootable installer for macOS?Īll the available installer can be found on the Mac App Store, including macOS Monterey, macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra and OS X El Capitan. ![]()
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