After backing up my jailbroken iPhone 5 and restoring it to my iPhone 5S, there have been multiple prompts that seem to repeat themselves every few minutes. These are "Sign In to iTunes Store" prompts but the emails in the prompts are not mine. These prompts have a password grid. However, when I press Cancel, the prompts repeat themselves after some time. If I key in a random password, and press "Ok", it asks me to go to settings. If I just click "Ok" it will tell me to enter a password. What should I do?