Can not connect to Wifi (2.4 WPA2)

Hi team,
My iphone 5s (IOS 7.0.4) has problem to connect to the WIFI in my office (2.4 WPA2 - corporta use router, setting could not change), before I go to China local apple store, I have tested other apple devices, including iphone5, iphone4s and iphone4, all of them can easily connect to this WIFI. And my iphone5s network setting has been reset for more than three times.
The WIFI issue is not replicated as I dont have any issue to connect to other public/private network. The genius tests my iphone5s and confirms that no issue is found, so he suggests that, I should choose "other" and put WIFI details. However, it does not work at all.
Could anyone help?
Thanks,
Luhouse

Update - resolved our connectivity issue. Turns out it was a MAC address filtering problem on the Airport network.
Some months ago we tried enabling MAC address filtering on our network, i.e. where you add the MAC address of each device on your network into a list on the Airport and set what access it has. I'm pretty sure we then decided it was unnecessary and left in the default option which is that unknown devices are allowed unlimited access once they connect. I know that I logged a visiting consultant into our network last week and they had no problem, even though I hadn't put their MAC address into the list.
Today, 3 devices couldn't connect. After a full day of troubleshooting, turning off MAC address access control immediately solved the problem. Now we haven't made any changes to our network configuration in the last 24 hours, nor any changes to the devices that started having problems. So I think, but I can't prove it obviously, that Apple pushed a silent update that changed that default option from 'unlimited access' to 'no access'.
Luhouse - this might not be your problem at all, probably isn't, but leaving this here in case it helps someone else.

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Can not connect to Wifi (2.4 WPA2)

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