I rooting my phone using Odin3 v1.85 and running one click after. I now wish to unroot the device i've followed the guide here [GUIDE] Debrand & Rebrand back to O2 for Samsung Galaxy S2 - xda-developers i've got to the stage of loading the stock files. Everything went well. the warning message has gone and all seems good. although the kernnal version still reads "220.127.116.11-i19100xwkdd-cl161513 root@DELL103 #2. is there more steps i need to complete? do i need to click unroot on one click? also the guide talks about resetting the CSC code? i dont really understand that. I have a sim free model. no branding from stock. I hope someone can help me in plain english. Look forward to help.