Reseting the phone completely

[Samr]

I am sameer and i tried to root my phone bt couldnt root prply so need to reset my phone completely plz hlp plz

[Qatrium]

I'd suggest that you do a PC Companion phone repair, this will do a clean installation of the latest firmware and will also wipe your internal memory.

Open PC companion -> Support zone -> Phone/tablet software update -> Repair my phone/tablet (blue link style). Follow the steps given, do not connect your phone until prompted to press volume down while plugging USB cable.

http://www.sonymobile.com/gb/tools/pc-companion/