I want to root my samsumg galaxy s3 i9300 SGH-T999 andriod 4.1.1 kindly help.

[AC Question]

I have tried all applications to root like cf root, kingo root, cwm/twrm, oneclick root etc. but iam unable to root it.
Supersu error: su binary to be updated.
tried to update su binary but not working.
i have tried all version supersu like 0.87, 2.0, 2.46.

below is my device details.

Board: msm8960
boatloader: T999UVDMD5
Build : i9300ZSEMC1

kernel v.3.0.31-538866
Nov 20 22:42:27 kst 2012

Pls help ow to root?