Remove the camera panel by hand (black cover above the battery slot).

Be careful, there is a cable attached underneath the camera panel.

Gently pull the camera panel away from the phone to detach the cable.

During reassembly, reattach the cable by holding the silver-plated ending slightly above its slot and using the spudger to gently press it into its fitting. Then, insert the camera panel so it is flush with the back panel again.