Note this is only for Unlocked Bootloaders.
1.Install the flashtool on your Pc.
2. Go to C:/ Drive > flashtool > firmwares > delete everything present and Put the kernel (Mt11i_4.1.A.0.562)
3. Run Flashtool click on the flashing icon ( left side below "file" option)
Select flashmode > ok
Setup should be like this > select OK
4.Follow the steps connect your mobile and flash.
Flashtool may show error after flashing kernel, no worries. Even your build number, android version won't change. Everything would remain same. So please don't go to phone settings to check anything.
5.Close Flashtool and run DoomLord's tool.
6.Then again Flash the kernel .587/431(according to steps 2 and 3) Whichever you were using before,Restart and check for 'Superuser' installed
Credits To 'Nabeel' at Sony Developers!
And DoomLord Ofcourse!!
Press thanks:good: if Helped .