CPMobile 2.1 has been updated to support iOS 8.1 while retaining backward-compatibility with iOS 6 and iOS 7.
If you upgrade your CPMobile devices to iOS 8.1 from iOS 6 or earlier, you must "unseat" and re-register each device before you can begin using CPMobile 2.1.
CPMobile is not compatible with iOS 8.0, 8.0.1, or 8.0.2. If you are using one of these iOS versions, you must update your CPMobile to devices to iOS 8.1.