Heat up the back cover. and focus on the bottom. Use Suction Cup to make a gap. Use plastic card to insert and cut back cover sticker. Cut the sticker on two sides. Then you can remove the back cover. Undo 5 screws with PH#000 Screwdriver. Loosen the plastic bracket form here. The bracket is thin, be careful. Release the Signal cable. Take out the Antenna from the Motherboard. Connect the signal cable and put it back to metal holder. First put back the plastic bracket. Tighten up 5 screws. This part should be fitted with here. Make it match to the back cover. Make the sticker adhere to the cover. Focus on the corners. Heat it up for 10 seconds. Make it adhere to the back cover well. Remove the protective film. Put back the Back Cover. Make it match to the phone.