MacBook Air (Original): Cannot select Ethernet during Setup Assistant
After you start up your MacBook Air for the first time and connect a USB Ethernet adapter during the Setup Assistant, the Setup Assistant may not allow you to select Ethernet to transfer your information from another Mac or to configure your Internet connection.
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Connect the USB Ethernet adapter before you power on your computer.
If you have reached a step in Setup Assistant where the Ethernet options are grayed out or not displayed, follow these steps: