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Once the battery and the motherboard have been removed, the inner framework can easily be lifted up off the LCD assembly.
Good news everyone! The second Wi-Fi antenna is held in place by mild adhesive, so it comes out fairly easily.
In addition to housing the Wi-Fi antenna, the inner framework is home to the ambient light sensor/microphone/front-facing camera ribbon cable and headphone jack ribbon cable. Check them out:
Ambient light sensor
MD v1.2 Microphone
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