Before removing the casing, we will have to remove the SIM and SD trays. To do this, we will use the tray opening tool that, introducing it through the hole in it, we will make it self-ejected.

In order to remove the back cover, first we must remove the two screws hidden behind the "window" of the infrared sensor.

Then we will leverage with an opening tool to extract it.

Now we will remove the adhesives to start disconnecting the components connected to the motherboard.

We finished disconnecting the components of the motherboard and removed the screws to disconnect the battery.

Unfasten the vibrator and remove the screws that still hold the plate. Then we will disengage it by gently prying.

To reach the headset, first we will have to remove the upper auxiliary plate.

We will remove the screws and remove the flex cables that may bother us before dislodging it.

After the auxiliary plate, we will find the headset embedded in the upper part of the chassis, which we will take off and remove.