[Q] How to go from CM9 to Stock Samsung ICS ROM?

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http://forum.xda-developers.com – HI everyone, I need some serious help. please help. :( Currently I have Galaxy S2- Gt-i9100 with Siyah kernel and CM9 rom but I want to go back to the same kernel and GB rom(or ICS) that galaxy S2 comes by default from Samsung (i guess it is called stock rom). I don't know much about flashing etc. Can someone tell me how can i do that? (HowTos)