I'm hoping to update my JB 3G. I'm currently running 3.1.2 which I JB with blackra1n. With iTunes 9.1 installed, running Windows. At minimum I'd like to update to 3.1.3, just to be able to update a bunch of my apps (and install Netflix) but if I can get to a 4.x firmware I'd like that (multiple exchange accounts would be great). I don't need an unlock. What are my options? And what do I need to backup manually and how would I go about that? (I have iphonebrowser currently).