hi all, Iv had my iphone 4s JB since release. Everything has been fine but iv recently upgraded from a av composite cable to a av digital cable. Now when i connect to my phone it says i need an ios upgrade. After reading more the new cable is only compatible with IOS 5.1+ The reason i need the phone to stay JB is because the sky sports app blocks mirror output. Which is what i use the cable for. So my question is, i have a jb iphone 4s on IOS 5.0 and i need to upgrade to anything above 5.1 Any help would be appreciated.