I am trying to fix my grandson Iphone 7 phone it will not update and will not work. We continue to get error 4000

If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support

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Error 4000 (and many others)

What this means is that there is a problem with your USB connection and the USB communication to your iOS device isn’t working. To resolve this issue, (a) use a different USB cable, (b) use another USB port on your computer (c) unplug any extra USB cables such as printer etc. Keep only the essentials; keyboard, mouse and your iPad or iPhone.

If that is true then you have a different problem. Rather then highjacking this one you should start your own thread for your problem. On that thread provide full details about your problem and what you have tried so far to resolve it.

i tried that it did not work