I am still new to jail breaking and want to understand everything better. I jail broke my iphone4 for the first time literally a week before they announced the new IOS5 release date. I decided today to ditch the jailbreak and try out IOS5, thinking that I could just downgrade if I didn't like the new OS. I then read something about basebands for 5 not being able to be unlocked (that's what I got from it) and I need to preserve my old basebands before updating. (Here is what I read) http://www.idownloadblog.com/2011/10/13/how-to-preserve-baseband-upgrading-ios-5/ Basically I want to know 1) Can I still preserve my basebands or am I to late. (I currently have IOS5) 2) Can I jailbreak IOS5 without modifying the basebands. ( I don't want to void my warrenty). Let me know if any more clarification is needed. I'm just trying to learn this stuff so I don't screw up my phone. Any help is appreciated.