Well, here goes my only up-vote to this entire thread ... (BTW, I do not downvote). This data is hexadecimal and so-far it seems to be well-formed in that respect. But, looking at it with more-than a casual glance, thinking about “the problem behind the problem,” I wonder about the underlying data-stream that might lurk beneath this most-unusual representation of it. And, I have grave concerns about the process, whatever it is, that is collecting that stream to form this file.
For instance, I am rather surprised that the “expected” data consists of a single digit within a 32-bit word. (Why is the program wasting all those zeros? And, do we in fact know that it is? Then, when “garbles” come in, I see FFFFFFFF (decimal “-1” which could be intended as “1,” and stuff like 6C163512 ... a “jumble of bits, closely packed,” which truly(!) flies in the face of all previous expectations.
Do we, in fact, know that the apparent parsing of this data-stream into 32-bit hexadecimal groups means that the underlying data is, in fact, parsed into those groups? Or, might the grouping be utterly immaterial, such that we should be regarding the data as a bit-stream? (And, is the program that is tasked with gathering the data-stream to create these files, in fact, malfunctioning?)
Immediately fearing the possibility of “Garbage In = Garbage Out,” it would be most helpful to me if the OP could post more examples of the data stream. First, “typical” sequences, and then, “anomalous ones,” taking care to provide the latter examples in context. Also ... “tell us all that you know about this situation and about this particular upstream program.” Exactly what is the nature of the forms of interference which might be disrupting this data stream?