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I couldn't find the minimum iOS version that AppFeedback supports in the Telerik documentation but I've found an issue with iOS 6.1. I've verified that when the AppFeedback plugin is enabled and launched on any iOS 6.1 device (using Cordova 3.2 or 3.5), the app always crashes on load. I've tested on current apps and also on newly created basic AppBuilder apps. I've verified on iOS 6.1.5 and 6.1.6 devices.