MY iphone 4s cannot connect to wifi after updating to ios 8.1.1

after updating to ios 8.1.1, my iphone 4s cannot connect to wifi at all.
at first, connection will show up, but when i tried to connect, i will see the wifi logo but after 15 or 30 seconds, connection will be lost again.
i will try again, but this time, my phone will hang, i need to restart but then, wifi will not work at all.
it will show that its searching for network but its not. then it will hang again,
after this, give up already.
my phone is working perfectly fine until updating my ios to 8.1.1.
the problem is i cannot upgrade again as i cannot connect to wifi.

Settings/General/Reset - Reset Network Settings. If you can't turn WiFi on see: http://support.apple.com/kb/TS1559

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