First, be certain you are using iTunes 12.7 or later, as this is required to communicate to an iOS 11 device.
Next, if you are using a valid iTunes version:
If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support
Apple Event: May 7th at 7 am PT
First, be certain you are using iTunes 12.7 or later, as this is required to communicate to an iOS 11 device.
Next, if you are using a valid iTunes version:
If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support
First, be certain you are using iTunes 12.7 or later, as this is required to communicate to an iOS 11 device.
Next, if you are using a valid iTunes version:
If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support
What to do when trying to connect to iTunes says the value is missing?