Open the back cover.
Using a screwdriver (Phillips 1.5 mm PH000), unscrew 2 bolts and using a screwdriver (hex T5), unscrew the 4 bolts in the frame of the phone.
Using a screwdriver (Phillips 1.5 mm PH000), unscrew 2 bolts in the lower PCB. Remove the microphone cover.
Disconnect connectors of the inter-board cable and of the coaxial cable from inside and remove the lower PCB.
Disconnect connector, unstick the label and inter-board cable.
For careful separation, we recommend using a heat gun. At the same time, it is necessary to heat carefully in order, not to damage the surface of the device.