Why when i try to download the updates am i suddenly getting the message invalid signaute

recently since i last updated my ipad with the icloud software every time i try to download all apple updates i am getting the message invalid signature, also i lost two icons can anyone help?

Are you trying to do this over the air, or by the phone. Or are you trying to do this with the computer and iTunes? How do you get the Internet for the computer if using the computer? You cannot use the iPhone for tethering and updating at the same time, it will disconnect. If you are trying over the air and getting an error, try connecting the phone to the computer and iTunes and update that way.

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