Remove Controller's Back Screws. Flip the PS4 controller over so that the back is facing you. Next, locate the four small black screws that sit just above the joysticks on each side. Once those are removed, gently pull the joystick pads out of their grooves and set them aside. They should still be connected by a thin ribbon cable.
2. Detach the Controller by It's Separation Point. The next step will be easy, but possibly a bit worrisome. Don't worry though – it's pretty simple and well explained in detail in this guide from Sony: just gently twist and pull apart the controller halves until they're free from one another.
3. Disconnect First ...