Open the panel on the side of the screen hiding the screws.
Using the key tool, open the SIM card tray and remove it.
Do not push too hard this may cause damage.
Disconnect the battery connector. The battery model of Acer Liquid S2 S520 is BAT-M10.
We strongly recommend disconnecting the connector to avoid a possible short circuit during disassembly.
Using a screwdriver (Phillips 1.5 mm PH000), unscrew 5 bolts in the PCB.
We are not sure about the Torx screw, this phone has been repaired before.