GB or ICS or JB stock rom only

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http://forum.xda-developers.com – Hi I am running xxlsj for a few days and its good with Nelp4 modem. I was wondering for an optimal performance os for galaxy s2. Will it be ginger bread or ics or jb? I know there are custom roms kernels etc available but I am only interested in stock roms so please keep it to the subject. Any thoughts? Ta I Sent from my GT-I9100 using xda app-developers app (HowTos)