You cannot update your phone via PCC if the bootloader is unlocked..you have to use flashtool to update it or else if you've taken a TA backup then, restore it to relock the bootloader and then you can go ahead and update it via PCC..if not then you only have an option to update it via flashtool
Hit thanks if I have helped you..
Sent from my lt26i using xda app-developers app
Sony Xperia S LT26i
ROM: Trinity Vengeance RaptorXL™ HD 4.1
KERNEL: Trinity Ultimate Kernel