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iOS 11.2 is the current version. When they eventually release 12 it should be usable on the any pro. If you can'y get past 11.0 you might want to talk to Apple, or make sure you have enough free space to download and install the image. The Apple iOS page should be able to tell you how much space is reuired (usually no a lot, 1-3 GB, and then only during the upgrade.)
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