I rooted(i got unlock code for sony ericsson's site) xperia S a week ago.I use the latest firmware(rooted) 6.0.A.3.73 Is there any way to unroot the phone and go back to the factory settings? Thank you!
Yes, You can relock the boot loader and then re-flash using PC Companion or SEUS to go back to stock. The link for relocking and guide is here! I'm not responsible if you damage the phone. Read the instructions properly and read again .