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

If you connect your device to your computer with a USB cable and iTunes doesn’t recognize your iPhone, iPad, or iPod, get help.

If you connect your device to your computer with a USB cable and iTunes doesn’t recognize your iPhone, iPad, or iPod, get help.

If you use a Mac:
1. Hold down the Option key, click the Apple menu, and choose System Information or System Report.
2. From the list on the left, select USB.
3. If you see your iPhone, iPad, or iPod under USB Device Tree, uninstall third-party security software. If not, contact Apple Support.

If you use a Windows PC:
Follow these steps to reinstall the Apple Mobile Device USB driver:

1. Disconnect your device from the computer.
2. Reconnect your device. If iTunes opens, close it.
3. Press the Windows and R key on your keyboard to open the Run command.
4. In the Run window, enter:
%ProgramFiles%\Common Files\Apple\Mobile Device Support\Drivers
5. Click OK.
6. Right-click on the usbaapl64.inf or usbaapl.inf file and select Install.

7. You might see other files that start with usbaapl64 or usbaapl. Make sure to install the file that ends in .inf. If you’re not sure which file to install, right-click a blank area in the File Explorer Window, click View, then click Details to find the correct file type. You want to install the Setup Information file.

8. Disconnect your device from your computer, then restart your computer.

9. Reconnect your device and open iTunes.

Taken from:
https://support.apple.com/en-us/HT204095?&cid=acs::fm-itunes_HT204095-93716