I just bough a used iPhone 5S with 7.1.2. I will be carrying zero new content onto the new device. Is it necessary to do a iTunes DFU restore to 7.1.2 before jailbreak or can I do the Reset Content & Settings on the iPhone and be good to go? I assume the phone was updated to iOS 7.1.2 via OTA when it first came out and I thought I read that it was better to do a DFU restore of 7.1.2. Thoughts?