If your screen is cracked, the suction cup might not really adhere, and the screen might crack more.
Precised by Dennis Kim, but to remove the screws you need a TORX TR8 screwdriver (I guess it’s a Torx size 8)
Also, in my phone, the mother board had a thin black cable connected to the down speaker.
EDIT: You can disconnect the cable by using a prying tool to gently "unclip" the connector.
Do not just try to pry open!
Here you have to be careful, there are two plastic parts restraining the motherboard.
- If we use the above picture as reference, there is the first plastic piece in the top right corner: push it out of the way.
- Second piece of plastic: imagine the motherboard as a rectangle; the plastic piece is in the middle of the bottom segment.
- Push it out, pry out.
Using a Pry tool damaged a bit the casing of the battery. I ended up pulling the battery's plastic sticker to remove it (adhesive holding the battery in place)