Guys, I have an iPhone 4 with an iOS 10 jailbreak. I use this phone these days only for TomTom. But something odd has happened to it. All of a sudden the photo on the lock screen changed itself! No one has touched or changed the picture, and one morning it just changed itself. Also, it is now asking my for my Apple ID and sign in. I've put the password in on the iPhone 4, and I receive a authentication passcode on my iPhone 6 which is my Trusted Device, but there's nowhere for me to enter the passcode on the iPhone 4. What has gone wrong with the photo changing? And is there a way for me to enter the passcode on the iPhone 4?