Remove the screw holding the flex going from the frontal camera

Disconnect the flexes going to the motherboard from the buttons, the screen, the battery, the bottom circuit board, the fingerprint sensor and the frontal camera use of an opening tool is recommended

Remove the SIM/SD-card tray either with a tool coming with the phone or a needle of sufficient size, otherwise the cards, the tray or the motherboard may be broken

Remove the motherboard

Remove the speaker marked on the second image