I PM'd you with a question about some information that we need before you can reflash back to stock. We need to know which device you have. There are two Galaxy S2 devices - the Original i777 and the newer skyrocket i727, assuming you're in the US. 9100 is for our european friends
http://forum.xda-developers.com/showthread.php?t=1449771
thats the link you need for your i9100