Apparently there are security countermeasures in place to prevent the cal data being written back in via GPIB (Understandable for this sort of equipment, can't have bad actors poking around ruining critical measurements...), so for now the only way to restore the cal data is to write to the NVRAM chip directly in a chip reader.
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My skills are very much not in decompiling firmware, so I'm of no help, but if anyone out there were to figure out how to restore the cal data via GPIB, a lot of us would be quite happy...
I wonder if there are some secret commands, or if the replacement of an NVRAM by Keysight is always followed by a full calibration anyway, making the whole thing moot for them?
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Jared
Jared Cabot