So my iPhone 4s is jailbroken and I want to update to 5.1. I dont care if it removes my jailbreak. I've been trying to update but every time I get, "This device isn't eligible for requested build." I've tried putting my iPhone into DFU mode and restoring but it still doesn't work. Oh and I've also tried update straight from my phone but I receive the following message:" An error occurred downloading iOS 5.1." Anybody know what to do?