If your iPhone, iPad or iPod touch has a newer version of iOS than is supported by your Mac, you may see this alert: "A software update is required to connect to your iOS device. Would you like to download and install this update now?"
Click Install to download and install the software so your Mac can update or sync your iOS device. If you continue to see this alert, make sure that your software on your Mac and iTunes are up-to-date.
If your Mac doesn't recognise your iPhone, iPad or iPod touch, learn what to do.