Samsung GT-i9100 rooting

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http://forum.xda-developers.com – I've tried many possible ways to root it and everytime after i press the start button on odin my phone restarts and gets stuck on the "samsung galaxy s2" logo and doesn't power on fully and i don't know what to do... can someone please help me? this is my phone's info model number- GT-i9100 version 4.0.4 baseband version xxlq6 kernel i9100xwlpu build imm76d.xwlpu (HowTos)