I have a Samsung Galaxy S2 plus (GT-i9105), running Android 4.1.2 (Jellybean).
I really tried evereything – with Odin, with apps, with other programs. I tried to update with Samsung Kies, but that doesn't work.
I want to install CyanogenMod. I tried with the CyanogenMod Installer, but doesn't work. Now I'm out of ideas. Could you give me any pointers on how to succeed?