So i wrote a little guide on xda forums, on how get Xperia S rooted after it got it’s update to Jelly Bean. It was a compilation of needed steps for newbies like myself, to root our phone and if you don’t wanna flash DooMLoRD’s pre-rooted firmare or anyother kernel stuff if it freaks you out (like it does to me), and until we’re not able to use again RootManyAndroid by Bin4ry to get it rooted
So all credit’s go to and the one’s who helped him achieve his goal. BTW: This is for Unlocked BootLoaders
1) Install fastboot drivers (if you havent already) for your xperia S. (it will be a pain, but follow this): http://bit.ly/19VVFCW and download fastboot as well.
2) You need to install the custom recovery by DooMLoRD here and do the following
a) Download his files and create a folder “fastboot” b) Place custom recovery file in that folder along with fastboot files c) Turn off your phone d) Plug your cable to phone e) Pushing VolumeUp button enter on fastboot mode f) Open the fastboot folder g) Press shift+rightclick and choose open cmd window here
3) Follow these DooMLoRD instructions
type: fastboot flash boot S_DooMLoRD_AdvStkKernel_FW-200_v2.elf
4) enjoy your rooted phone