A new tool called OSRestoreX has just been released as an alternative to Saurik’s Cydia Eraser.
OSRestoreX will allow you to unjailbreak/delete Cydia from your iOS 10 – 10.2 device without updating the firmware and also without a computer.
This is ideal for those with major Cydia or system issues that can’t be fixed any other way.
Above is a video guide on the process.