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dk tm4c129x usb issue

Hi All; 

We have two different looking boards of the same type with different behaviour.  The usb software that works on one board does not work on the second board.  The second board does run the TI software though.    The boards look different - ie slightly different components etc.

a) Is there different versions of this dk tm4c129x board?

b) What changes were made to these boards over time without a  new version of the board?

Urgent request for customer support....

Kim