Open the back cover.
Lift and remove the battery.
Using a screwdriver (hex T5), unscrew 6 bolts in the frame of the phone.
Pry and remove the middle frame.
The middle frame.
Disconnect connectors on the PCB.
Overturn the board, disconnect the connectors from the inside and remove it.
Using a screwdriver (Phillips 1.5 mm PH000), unscrew 1 bolt in the upper PCB.
Lift up the upper board, disconnect the connector from the inside and remove the board with inter-board cable.
Disconnect the connectors on the PCB and remove the main and front (selfie) camera, power & volume buttons flex cable and a flash.