For all you GT-i8190T XT owners I have made a public folder in my drop box with all required files to root your phone reliably
1 Unzip odin
2 Use three button combo to put your phone into download mode, (turn off completely , hold home, volume down, and power - for those that don't know) press up I think it is to confirm download mode.
3 with device connected to Odin flash the. MD5 file in the PDA section (do not tick repartition)
4 after reboot connect phone to pc and move the update superuser to your external SD can be done before to save time.
5 turn phone off again. And then go into recovery, home+volume up+ power hold until the first screen comes up.
6 flash the update super user from your external SD.... Important it's external SD..
7 reboot phone enjoy you rooted stock GT-i8190T
Just use rom customiser from the market to remove all your bloat ware
Sent from my GT-I8190T using xda app-developers app