The contents of the ExtraData column is probably a serialized data structure. The names will define the elements of the structure. The data is the non-legible characters between them. It is a matter of working out what the datatype is and decoding that. For the example you have, it is probably an integer. But, it could be something else.
It should be possible to decode. It is a matter of working out what each element in the structure is made up of. You can examine the firmware and find hints to the structure. And maybe work out what the exact datatypes are.
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