The March 2015 update of Apple's 13" MacBook Air features fifth generation Intel Core i5 and i7 processors, resulting in slightly increased performance and battery life.

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Firmware Got corrupt while downloading update.

My MacBook Air early 2015 model's firmware got corrupt, while downloading and installing Macos High Sierra Beta update 2. Macbook not booting up. when loading previous version of OS, the terminal responds. OS not supported.

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Its important you tell Apple! I would even bring it into an Apple Store so they can fix things here.

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Try restoring using Internet recovery.

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