Get under the bottom layer with something thin and pull it off. You might need to use quite a force as it's glued pretty well.

Take the screws out with torx 6. A T5 might work as well.

Open the device.

The top part is housing the speaker with all boards and components.

Take out the mainboard screws with a torx 5.

Be careful by lifting the mainboard. The LED panel and the control board are still connected.

Open it from the side on the volume up button.

Take a spudger and lift the connector off. Careful! It opens from the opposite site to which the cable is going to.

Best place is in the bottom part where it originaly sits.

Open the four torx 8 screws.

Lift the speaker outside the speaker grill.

Carefully pull the partially glued connector cable off.

Use a torx 6 or 5 to take out the two screws.

Pull it in the direction of the arrows to take the panel out.

Loosen the four screws.

Pull of the glued connector cable.

Lift the lock, which is again on the opposite side of the cable.

Beware pulling the cable out. Don't pull it up, pull it as low as you can. See the arrow.

Remember how the board is placed because there isn't much of a difference.

As the controller board sits quite tight better use the flat side of a spudger to lift it off.

Use the leverage effect.

Thats the controller board.

On the other side are the buttons. Remove the rubber cap.

The device uses three types of screws.