Remove the battery cover we apply heat. We are going to use a suction cup to open a hole. We introduce a metal opening tool. Furthermore, we apply isopropyl alcohol, we use a plastic card to cut the additive. Furthermore, we remove the back cover, we'll remove the screws from the middle frame. Furthermore, we have to eject the SIM tray and the micro SD tray.
Furthermore, we are going to remove the middle frame to continue with the disassembly process. Furthermore, we have to remove the battery flex. Here we have the motherboard flex cable, we apply isopropyl alcohol. Let's remove the battery, we returned with the assembly process. The device is working.
Source : MovilOne Phone Repair