It easy to open the battery cover Take away the battery after powering off the phone. Peel off the warranty label. There is a hidden screw. Pry off the back frame with plastic card. Pry up LCD connector, remove the back screw and pry up the headphone jack connector. Remove the motherboard carefully. There is some sticker beneath the flex cable. Pry up the holder. Latch the motherboard onto these two screw holes. Fasten the back frame.