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[* black] Remove the speaker enclosure assembly from the iPhone.
[* icon_note] Before reinstalling the speaker enclosure assembly's screws, be sure the Wi-Fi grounding fingers are installed below the lip in the iPhone's metal case as seen in the second picture.
+[* icon_note] Apon reassembly, it is handy to have a friend hold down the speaker enclosure while you tighten the screw together with the plastic bracket near the dock connector cable. This will ensure the grounding fingers are held in place while you can concentrate on keeping the plastic bracket in place and tightening the screw.
[* icon_caution] Before reassembly, be sure to clean all metal-to-metal contact points between the grounding fingers of the Wi-Fi antenna and the case of the iPhone with a de-greaser such as windex or isopropyl alcohol. The oils on your fingers have the potential to cause wireless interference issues.