iPhone 6 and 6 Plus stuck on loading bar or update screen

This happens when the WiFi IC was broken . It is needed to be replaced with a new one .​The phone may falls into the water or drop down that is the reason why it is broken.So let's go to see how to fix it . 

1.Turn off the phone , disassemble your iPhone and take out the motherboard.

2. Remove the WiFi IC with 370C degree . Please trust your skill before doing this.

3. Clean the glue and the lead from WiFi area .

4. You must replace it with a new one if it is necessary ,or still use the old one by cleaning the glue and the lead  . 

5. Reboot the phone . Restore the device with a new firmware if it doe not work .