To remove the back cover, we will detach it by inserting a spike between it and the frame. To make the task easier, we can heat the lid for approximately one minute at 60ºC.

We extract the screws indicated in the second image to be able to remove the intermediate casing and the lower antenna module.

In order to remove the motherboard, first disconnect the components.

Remove the screws that hold the motherboard and the SIM and SD trays.

Now we can remove the motherboard.

To finish, we just have to disconnect the cameras from the motherboard.