iPhone 4 Battery disconnection

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Use a plastic opening tool to gently pry the battery connector up from its socket on the logic board.
Be very careful to only pry up on the battery connector and not the socket on the logic board. If you pry up on the logic board socket, you may break it entirely.
Remove the metal clip covering the antenna connector.
The oils on your fingers have the potential to cause wireless interference issues. Be careful to not use your fingers.

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