I have been looking at what 4.1 offers and I'm really not impressed. I have had no proximity sensor issues, no reception issues, gamecenter does not interest me and I don't rent media from iTunes. So I will be sticking with my jailbroken 4.0. However I am starting to see some HDR photos coming through and they look brilliant. So I was wondering if there was a way to get HDR on my iPhone 4 on 4.0 since its jailbroken?