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[Dsabine26]

What's error 300-4?

 

[twerppoet101]

This article does not seem to show your error code, but maybe it will be of some use anyway; depending on why you are seeing the code.

iOS: Resolving update and restore alert messages

If you have more information related to what you are doing when getting the error code, I might be able to find more out; or not.