Although Ive done alot of research on this topic, I still have alot of questions that I cant seem to find an answer to. I have a jailbroken Iphone 4 thats running 4.1 and I want to upgrade to IOS 5 (or any stable version). My version is running fine but there are a few apps that i cant install because of my 4.1 version. I keep hearing the word "baseband" and I'm not sure what it means or how it pertains to me. My questions are: 1. How can I upgrade my Iphone 4 (v4.1) to v5? 2. Will i still have all of my jailbroken apps intact as I do now. 3. Is it pretty straight forward in regards to how to upgrade. 4. Is there anyway to backup my phone in case it fails i can revert back to how I have it now?