CyanogenMod | Android Community Rom based on Jelly Beanhttp://www.cyanogenmod.org
Information: Samsung Galaxy S II ("i9100")
http://wiki.cyanogenmod.org/w/I9100_Info
How To Build CyanogenMod Android for Samsung Galaxy S II ("i9100")
http://wiki.cyanogenmod.org/w/Build_for_i9100