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Translating step 19
Remove the lightning connector assembly.
Use a plastic tool to scour any bits of adhesive residue from the rear case.
Make sure the Lightning connector assembly is correctly positioned so that the two white dots on the iPhone's rear case show through the two circular cutouts in the Lightning flex cable. If they don't, the flex cable will remain misaligned and you won't be able to reconnect it to its socket on the logic board.