After you removed all 13 screws holding the camera bar and the additional 18 (or some, I lost my count) holding the main board, you can start detaching the accessories and cables that connect to the main board.

There is a silver fluffy tape coverinf some of the screws. Make sure you remove it to get access to them.

Detach the phone jack

Detach the rear camera

Also disconnect the left speaker cable connector and the antenna