Default HTC One m7 802D dual sim Chinese version running 4.4.2 Soul-26.0 having WIFI problem

I bought it on Ebay. Dual sim beautiful phone. It is rooted and running Soul-26.0 Android 4.4.2

Now I'm having some trouble with WIFI WPA connections. I should note that I can connect to WEP or WPA2 connections without any problems.

And also having some slow 3g issues as well.

Does anyone know how to solve this issue? I'm willing to go back to 4.2.2 if I have to.

Please help me with some knowledge and experiences.

I have attached all the pictures of the phone information.
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