a) switch off your phone
b) then press power and volum down and when your device vibrates release the power button ONLY (no volum down)
c) after 15second release the volume down and connect your phone on USB (PC)
d) click on recovery.bat (folders download) : a command prompt will open,and after closed or whrite "done" -> disconnect your phone
e) remove battery and reinsert battery
f) boot into recovery (power + volum up) and flash UPDATE-SuperSU-v2.01.zip next reboot ...