You can update your device to iOS 12.0 over the air. Once you have done so you can use the following workaround to get iTunes to see your device.
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Download the current 12.8 installer for iTunes from https://www.apple.com/itunes/download/.
Unlock your iOS device and connect it to USB.
Install iTunes from the .dmg that you've downloaded.
Near the end of the installation it should announce that a further software update is required.
Install that and iTunes should see your devices.
Or wait for Apple to release iTunes 12.9 for Mac, which is likely to happen later today.
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Sep 24, 2018 2:20 AM