Iphone or ipad says unable to join the network?

I updated my ios to version 6.1.2 and then when i wanted to join Wi-Fi it says "unable to join the network." i tried everything… Any useful way? I will appreciate.

Go to options>Wi-Fi>press the blue arrow on your Wi-Fi connection then there will be a tab(button) on top saying "for get network" press it then rejoin, enter password. It will work

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