Support Change Rom on rooted S2

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http://androidforums.com – Hello, i've bought a rooted GALAXY S2 GT-I9100 with android version 4.0.3. Kernelversion: 3.0.15-I9100XXLPJ-CL140368 se.infra@SEP-94#3 But i'm new to this all. After reading the all rooted guide i checked my phone status with Root Checker and it seems all ok. Other applications installed are SuperSU and CWM. When starting CWM i receive error: This version of CWM Manager should be used wit CF-Root 5.0 or newer. it appears youy are running a different kernel. various features have been disabled. Since a lot of Jelly Bean roms are posted on the forums, i would like to upgrade to this version (General)