I have my phone running 4.2 jailbroken and i would like to upgrade it to 5.0 doesnt matter which i just want imessage. How do i do this with out going all the way to 5.1 and losing my jailbreak option. I have an iphone 4. I tried cntr updating with a 5.0 filmware but i get a message saying it is not eligable. Ive also tried using redsnow with the custom select a filmware but it gets stuck. How do i upgrade and keep my jailbreak. I realize im probably going to need to use an outside program. If it changes it the phone is registered as a developer device.