C++ classes that are located within a folder named "Device" cannot be seen or used within the Editor. The classes cannot be found within the Content Browser, and they cannot be used to create Blueprints, or to create new code classes that subclass from the class in the Device folder.
There is no option to create a Blueprint from the Actor class.
A Blueprint can be created from the Actor class.
Head over to the existing Questions & Answers thread and let us know what's up.