The rear speaker uses the protective inner plate as its housing and comes into play whenever there's no audio output through headphones or the speakerphone feature.
Locate the rear cover tab indicated by the red outline.
Remove the six 1/16" screws with a Philips head precision screwdriver.
Place device on grounded surface or use anti-static wrist band when removing inner plate.
If unable to grip plate, use spudger to carefully pry and lift out.
Locate the speaker within the area indicated by the red rectangle.
Use caution to avoid breaking the frame and ensure a secure grip.
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