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Force shut down your device,remove the back cover and with a small pen,tap that button.
If you do not have a wi-fi signal nearby,you will not get any icon in the upper bar.
Dude thats a hardware problem. Take it to nearby service center.
I can't enter on my home wifi on phone is written authentication problem what means that?
Forgot the network and add it again.
how much do they charge to replace the chip for wifi and bluetooth? any approx idea?