Samsung Galaxy SGH T989 Can;t root help

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I Follow this guiede http://androidforums.com/threads/guide-root-rom-the-sgh-t989.627099/
i intaller all TWRP and try to ClockworkMod Recovery 6.0.2.8 i enter in recovery menu and intall CWM_Root_Superuser_3.1.3_Busybox then i seee one icono supersuser
but my cellphone i check roodcheck say no root ..
i intalle superuser 3.1.3 liek 30 time XD...

Samsung Galaxy s2 t989 t mobile> jellybean 4.1.2

 

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http://www.mgyun.com/ that work for me aye