Use the flat end of a spudger to lift up the locking tab on the digitizer cable ZIF connector.

Use a pair of blunt nose tweezers to grip the cable close to the head and pull it away from its ZIF connector slowly and steadily to separate the coating.

Inspect the head of the cable and the ZIF connector for any remaining coating that could prevent a good connection.

Peel off the coating—heating the cable and the ZIF connector when the coating becomes too brittle.