Hi, I've been trying to update my iPhone 6 to 8.0.2 for a few days now. it has showed the download time to be anything from 20 mins to 20+ hours but every time it fails at some point of the download. i have tried restarting the phone and the macbook air several times any ideas on what i can do to fix this? I don't want to do it over the air in case of future jb problems. thanks!