Slide the flat end of a spudger under the PCB on the fingerprint reader cable and pry up to separate the adhesive securing it.

If you're having a hard time separating the adhesive, use an iOpener or hair dryer to lightly heat the PCB.

Don't pull on the cable or pry on the connector itself—only insert your tool under the board.

During reassembly, if the adhesive is still sticky you can reuse it. Otherwise, replace it with a strip of thin, double-sided tape.