Remove two SIM card trays.

Heat the back cover to soften the adhesive sticker.

Place the suction cup and to open a gap from top side.

Insert the guitar pick into the opening gap.

Slide the guitar pick to cut the adhesive sticker. Attention: when deal with the left side, the guitar pick would better go as the direction of the mark.

Release battery connector.

Free the fastening sticker.

Pry up and remove the battery.

3100mAh battery.

Twist off screws.

Remove three pieces of securing bracket.

Release all the connectors.

Remove the motherboard carefully.

That's Sony Xperia Z3 Dual motherboard.

Remove front camera and rear camera.

Remove that blocker beside the earpiece speaker at first.

And then you can pry up the earpiece speaker and remove it.

Remove transparent securing cover beside of earphone jack.

Pry to turn the flex cover on the earphone jack. But it's a part of the earphone jack assembly.

Cut the adhesive sticker between the earphone jack and midframe and remove the assembly.

That's antenna signal flex.

Twist off screws.

Release connectors.

Remove vibrator securing bracket.

Remove loudspeaker assembly securing bracket. And there is no any adhesive.

Pry up and remove the loudspeaker assembly. No adhesive, too.

Done.