S660 - Wifi Conectivity Issue

afterupdating my lenovo s660 my wifi isnt work properly.
actualy it is not working.
showing excelent speed, but not work.
please help.
Details As Follow.
LENOVO S 660
Android Version 4.2.2
Build No S660_ROW_S035_140415
BaseBand Version s660.v35,2014/04/15 19:35

Hi
Can you connect it to a normal Wi-Fi router or a free public Wi-Fi hotspot ?
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