This is one of the most common issues that users face when updating to a new i OS firmware.
The error has occurred when i OS 10 was released and may occur in the latest software update as well.
All you have to do is to plug in your device to your computer, launch i Tunes and then click on the update button from the Summary tab.
All i Pad models except the original can be updated to i OS 7, and i Phones from the i Phone 4 onward are supported as well.
When the error popup appears, you will be prompted with two options namely “Close” and “Settings”.
Press the close button to exit the error message, wait for a couple of minutes and then proceed with installing i OS 10 again from Settings.
Therefore, it is best to wait for a few hours or days before trying again, as the load on their servers will be reduced.
If none of the above solutions work for you, consider updating to i OS 10 via i Tunes on your computer.