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.
3. Clean the glue and the lead from WiFi area .
5. Reboot the phone . Restore the device with a new firmware if it doe not work .
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