Q: iTunes cannot connect to the iPad because an invalid response received from the device

Hello Biggit,

Thank you for using Apple Support Communities. 

I understand from your post that iTunes is showing an error when trying to connect your iPad Air to your computer. I know connecting your iPad Air with iTunes is important so you can take advantage of all of iTunes great features.

I recommend using the steps in the following article to help resolve an issue like this one: 

If iTunes doesn‘t recognize your iPhone, iPad, or iPod

Best Regards