MacOS Mojave Incompatible Updated on Older Mac Devices Alternatively, you can install macOS directly on your main partition to upgrade completely. Make sure the format of the partition is Mac OS Extended (Journaled). Open Disk Utility by selecting the same from the Utilities menu and select the partition where you want to install macOS and erase the same. For this press and hold the Alt/Option key when your Mac is turning on, before you hear the Mac startup chime and select your USB drive from the menu that comes up. ![]() Once the operation is done you require booting up your Mac off the USB drive.
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