Just want to share it with u how i made it work for me.
THIS IS FOR UNLOCKED BOOTLOADERS ONLY!
Do it all on your own risk, i'm not responsible for any damage!!
Did this all with the flashtool from here: Flashtool. Thanks to gregbradley
Flashed the 4.3 stock rom from here : Central European - Customized CE1 (1265-1620) (unbranded, untouched). Thanks to Dzadzef
Then i fastboot the 4.3 kernel : thanks to sj8023ld
Entered the cwm recovery and flashed the latest SuperSU from here : SuperSU-v1.93.zip
Then reboot the phone but stay connected the whole time with your pc/laptop with flashtool on untill it's all done and flashtool pushed his files !!!
Done, smooth like a rolling crystal ball !!!!