Stuck on 4.1.2 - clockworkmod doesn't want to install

view full story

http://forum.xda-developers.com – Hello. So, long time ago, I installed 4.1.2 (using Odin, because I could not do that through WiFi) and, additionally - speedmod kernel. And here goes my problem: I want to install cyanogenmod on my phone. I know that cyanogen needs clockwordmod installed firstly, but I can't install clockwordmod through Odin - it keeps failing (that red FAIL button in Odin). And now I don't know what to do... I have to remove that speedmod, I guess. Should I download stock firmware? Because I guess that I can't install that clockworkmod, just because of speedmod kernel... BTW I don't have root. (HowTos)