Rooting boost galaxy s2 4.1.2

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http://androidforums.com – Hello. I purchased a Samsung galaxy s2 from boost mobile last weeek and am interested in rooting it. This is my first samsung device as ive only used HTC and LG. ive read through this guide 2x but seeing as i just spen $300 i want to be sure im doing it correctly. i did update to JB through Kies the day i got this phone and It seems this guide was released for ICS. ive downloaded Odin and already have kies. My concern is this kernel repack GB27. im not sure what that is. i know what a kernel is as it relates to android as ive rooted every android device ive ever had. Ive read that the link in (General)