First, we must power off before repair. Then take out the Battery. Don’t forget to remove the Card Tray. Next, undo these 2 Screws with PH#000 Screwdriver. Remove the Complete Front Screen Assembly with Guitar Pick. This process will be a little bit harder. Be patient. Moving back and forth. Then do the same in the other side. Then put the Complete Front Screen Assembly aside. Remove the worn Volume Button Flex with Tweezer. Turn round the Volume Button Flex 90 degrees. Pressing repeatedly to make it attach to the Back Cover. Starting from the top of the Back Cover will be easier. Pressing it from left to the right. Tighten these 2 screws with PH#000 Screwdriver. Put back the Battery. The process of the boot is a bit long. Test it by pressing the Volume Button up and down.