I have Acer Aspire 3 A315-53 P4MY laptop, and wanted to install M.2 SSD Sata in it. Opened the back cover fully, but could not unscrew the M.2 screw. It is marked with a thin red line on upper side, unlike all other screws. Does it mean something? Tried all types of screw drivers, now the head is getting stripped a little. How to open it?