This explains why the code signature was not correct. The signature is calculated from all the files in your app, including Info.plist. If you need to modify any file in your app after it is signed, you will need to resign it so that it becomes valid again. Please refer to point 2 in my previous post for pointers on how to achieve that.
However, I am happy to say that our new version which is expected to be released in the next couple of weeks directly exposes the UIDeviceFamily property so that you won't need to modify Info.plist to specify iPhone or iPad support.
All the best,
the Telerik team
Share feedback and vote for features on our Feedback Portal.
Want some Kendo UI online training - head over to Pluralsight.