SuperSu wont install binary

I rooted my xperia sola using kingroot and tried to replace kinguser with supersu.
Simply installed supersu ,doesnt works!
Tried wolfdroid script,doesnt works!
It simply unistalls kingroot and installs supersu but binary installation failed!
I dont have a custom recovery installed.
I have read somewhere mounting
r/o can work, I tried with root browser end up loosing root!
Somebody help providing complete details.

Any help would be appreciated
By the way i'm using
Xperia sola
Stock 4.0.4 ics Rooted with kinguser
Build 6.1.1.B.1.54
Locked bootloader

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