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my 701 is upgraded fp1 and i have upgraded on the day i bought it...when turn off the wifi from the pop down menu in my phone it for many hours. It shows available connections when i turn it on but does no connect any network and the problem is solved after reboot
What you can first try is to remove all WiFi connections you have store on your device and then do a soft reset by dialing *#7780# with default code 12345. Then enter all WiFi connections again and see if the problem is corrected. If not then you may need to do a hard reset *#7370# with default code 12345. This will reset your device so please make sure you backup your device first using Nokia suite which you can download from the link below: