Recently I was victimized with 'ransomware' that locked up my Internet on my Ipad Chrome, it also froze all the other apps. Calling to the phone number posted revealed an $150 charge to unlock. Like that would be the end of the problem!. I decided to reboot the Ipad. I went to Settings>Reset>and selected 'Erase All Content and Settings'. This reset the Ipad to Day 1. Since I had backed up the Ipad to ICloud, it then restored all apps, data, and settings. The only thing I lost was my downloaded songs from Itunes which I am currently trying to restore, although all my music does 'synch'. So my advice is : backup to the Cloud and tell the hijackers to 'f***off" and reset your device.