Let me start by saying I'm a tech noob, so please be patient/kind with me! I updated my Samsung Galaxy S2 (unlocked from bell) to jelly bean using kies. After the update, I wanted to root the phone so I could also unlock it that way rather than use a code. I tried to root using this guide: androidforums.com/galaxy-s2-international-all-things-root/385099-how-unlock-root-bell-galaxy-s2-step-step-guide.html but something went wrong. I think I may have used the wrong cf root file, but I can't be sure (noobness) . Now my phone is stuck on the startup screen with the yellow triangle. I can get it into download and recovery modes, and have tried to reboot it from there but it still gets stuck. If somebody can help me with the proper cf root file or even get it back to stock, anything so that it's working really, would be great!!