The usual causes for error on most devices are when it is related to software issues. The thing here is that hardware, no matter how solid they are supposed to be, also contribute to the downfall of your iOS device’s functionality. Here are the common causes for this error to occur.
# Your iOS device is jailbroken.
# Security software on your computer is causing communication blockages between you and Apple update servers.
# Your firewall, either on Windows or Mac, is blocking communication between you and the Apple servers.
# There has been a network setting error or it has been corrupted in some way.
# In conjunction with the 4th cause - Your own computer has been known to hack or jailbreak another iOS device which caused confusion in device recognition.
# The USB cable caused an interruption in the update or restoration process.