Remove two (2) flat 6mm (BL) screws close to the connector using a T6 Torx bit.

Turn the case around so the back is facing you and remove two (2) 6mm (BC) screws from the back holding the connector to the metal stiffener.

The connector may be glued. You can use a spudger to carefully pry the connector away from the stiffener and loosen the glue.

During the next step, support the modem while removing the main board. It is connected and not supporting it could damage the connector.

Lift off main board.

A metal PCB spacer might loosen. Ensure that you clip it back onto the board during assembly.