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Sleep om te herschikken

With the device powered off, disconnect any external hard drives and flash drives.

Hold down the [option] or [alt] (⌥) key on the keyboard and power on the device.

When you see the boot selection screen as shown, release the [option] key.

Use either the keyboard's arrow keys or the mouse to select "Install MacOS High Sierra." Press [enter] or click your selection with the mouse.

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