[Q] Help Rooting Evo 3D

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http://forum.xda-developers.com – Hello All, I am experienced with rooting and flashing phones, mostly Epic 4g and HTC Hero, both for Sprint. But i have a friend that wants to use WiFi Tether and he has sprint's prepaid network, virgin mobile. He does have to root his phone in order to tether it right? Also some of these forums seem confusing to me. It seems more complicated to root. Can someone tell me the quickest and easiest way to root? He just wants it rooted he doesn't want a custom rom or anything. Thanks for your Help (HowTos)