Can't root Galaxy 5830i

A year ago I bought a Galaxy ACE GT-5830i which came with Gingerbread 2.3.6, recently I wanted to root it, I tried following the instructions in Root,Unroot,CWM,and how to Flash Galaxy Ace S5830i , without success. I wiped cache, Dalvik cache, rooted again, again and again but did not work. After the root process I found the *Superuser* icon on the launcher, I checked for root and even tried to use *link2sd* and nothing. I tried to update the superuser app from Google play and ... nothing. How to root this device?