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My onepluse2 phone wifi , Bluetooth is not working. Actually the phone got little bit of liquid damage . the srvice center people says need to be replace themotherboard which is with havy cost . the performace of the phone is very good except the wifi, bluetooth . i think the wifi antenna got damaged .. please suggest me How to fix this ???

You could try fixing it yourself but you would need to have a reliable parts supplier. And also hope you don’t damage it further.