Hi. Posting this here in the hopes that I can be helped. I had a 4s for many years and then purchased a 6s in 2015. It came on version 9.0.2 and I jail-broke the phone following a Google search on how and made sure never to update the phone again after that. Now comes the sad part. I made the mistake of updating the Youtube app on the phone. I do not know why I decided to update it, but I did...big big mistake! And since then, it crashes often and when it does work, the screen dims after 30-40 seconds, forcing me to tap on the screen to bring it back to regular brightness. Is there a way to restore my phone using an old iTunes backup from last October. This old backup has the old Youtube app which worked beautifully and I'm praying that there is a way to do this. Can anybody help? Please tell me there's a way to go back. I don't have an iPad and rely on my iPhone for everything.