I am a new Android user. I have been using android for weak now. My cell phone is Samsung Galaxy Gt-I9100 .My Android version was 4.0.3 ICS and I rooted it, installed the Super SU and CWM. I am already a Web Developer and a Software Developer (C/C++) so it wasn't hard to me to use Odin cause i already know the concept of programming. After I rooted my phone, it has been working perfectly for two days then i had to reboot my phone and after rebooting the cell phone gets stuck at the welcome screen which says " Samsung Galaxy GT-I9100" and i have like a caution sign under it. So, I went on the Download mode again and installed the Official Android 4.0.3 for Samsung Galaxy S II. Everything is good but the problem is that i get the error mentioned above and the phone stuck too often and i can't use it. By the way, When I installed the new ICS i found all my applications and settings saved so please help !!