Unhappy [Q] my device can't open the wifi now, pls help

Hi all
My is 521ver. , I change the one from sony store, the new one dealt is 2.36 fw. ,at the sony store, I have test the wifi, that is ok , well , I come back to home and update to the new fw(255), and I have reset the device , when is finished , I try open the wifi , that is show open, but it can't search any wifi singal, and there is show grey and blur , what problem now, I have resest again, but still no feed back, pls help



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