Kernel Flashing Problem

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http://forum.xda-developers.com – My Device: i9100 Official ICS 4.0.3 XXLPJ Rooted via CF Root Kernel Now the problem is that when i install any Kernel like i tried Siyah and slide2wake My phone dont start like a soft brick... Then to make it work i reinstalled CF Root Kernel.. Then phone started but the Kernel i installed before not installed... So Please tell me what is the Problem and how i can get rid of it? Please... Thanks Sent from my GT-I9100 using Tapatalk 2 (HowTos)