For Siyah ICS kernel, see here:- http://androidforums.com/galaxy-s2-international-all-things-root/518798-siyah-ics-kernel.html You will need to be rooted to install Siyah kernels. See here:- http://androidforums.com/galaxy-s2-...t/482994-rooting-galaxy-s2-dummies-guide.html For step-by-step installation and settings for the Siyah kernel, see here:- http://androidforums.com/galaxy-s2-...7-12-dummies-guide-installation-settings.html or, here:- http://androidforums.com/galaxy-s2-...-guide-installation-settings.html#post3727880 Siyah kernel v2.1 Final version is now available for download. Not to be confused with the Dark Knight Siyah 2.1 kernel... there are differences. Changelog updated CWM recovery to 18.104.22.168 and added back soft-key support (thanks to mustaka@xda for the back-key modification. sagol hocam… reverted 500MHz deep-sleep enter change for stability purposes bus frequency modification For more information and download, see here:- [KERNEL][UNIFIED] SiyahKernel v2.1 - "One kernel to rule them all" - xda-developers Both CWM .zip and .tar (for Odin) files available.