Android Xolo Q700s wifi issue

[navin007]

I have a xolo q700s a Indian Brand mobile i have rooted and used the kitkat version(help taken by a friend) till 3 months but some days later on this Saturday my mobile stopped detecting one of the wifi device setup in my office so i did not looked so deeply why and got to my work in night i was connected to my wifi doing chatting and in sunday morning when i switched on the wifi it was not detecting i was shocked i tried some tak tiks like going in the airport mod and connecting and changed the rom and to reset my wifi device and to lower the encryption level from wpa2 to wpa as the friend told but now it is connecting to only one wifi device in office from 4 but to not connecting to my wifi too where as my sister have a nexus 5 i did a hotspot but same result i took it to the mobile repairing guy he told he will change the chip but he may have inserted the old version of chip so the problem is going weird and i tried to going back to stack rom but cwm is not taking i need help it is just one year and i am from a middle class family .
I am from mumbai any body who can help will do ,
I want to go back to stack rom
Thanks in advance