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A bootable USB is the most reliable way to perform a "top" clean installation or repair a Mac that won't boot. download macos high sierra 10136 dmg mac top
Allow the process to reach 100%. Once done, your USB drive will be named Install macOS High Sierra . OS X Mountain Lion 10
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Ensure that your Mac is compatible with macOS High Sierra. Not all Macs can run High Sierra; it's essential to check Apple's official compatibility list.