I am from Costa Rica, I do have the same cel phone version you have.
I tried z4root to temporary root my android, then I proceed to install OCLF 2.0 to remove the lag, but after I restarted the android it didn't come back again.
I was able to turn it on but it were stuck after the samsung introduction video.
Just a black screen and no way to do anything.
I tried to press UP, HOME and POWER to get into the recovery mode but it didn't work, so I almost had a brick.
Lookin over the internet I found a small .bat file that I ran with the android connected using the usb cable and I was able to run the factory reset.
Finally I think I got my cel to normal, but I dont know if there are still a few "orphan files" because of the z4root and oclf 2.0.
I am sharing this experience with you just to let know what may happen with our model, I think most of the apps are made for Europe and North America, we may have a small differences on our phones because not everything is compatible.