The back cover is very well assembled, you will need the metal opening tool to make enough pressure on the metal tabs.

The side keys are loose, separate them when opening the lid.

Separate the back cover.

Remove the Phillips screw located next to the speakers.

Use the plastic opening tool to pry the plastic frame.

Help yourself with the prong to release the lashes that hold them.

Remove the adhesive that covers the speakers.

Peel off the speakers and separate the plastic frame.

Although the pictures show us, it is NOT necessary to extract the 3G antenna to desolder the speakers.

Unsolder the terminals of the right speaker, applying heat with the tip of the soldering iron and gently pulling the cable.

Repeat the process with the left speaker.