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Well, I have looked at the upgrade files for the JB and the Libre, and it provides part of the answer to my own question. (The JB download was JL04-v035d.zip)
It turns out that the upgrade file for the Libre is one encrypted file. You cannot do much with that.
But the JB upgrade file is actually a number of files, and one of them appears to be a shell script that does the upgrade. So, I imagine that, if you change that shell script to do other stuff, it might be very interesting. Anyone done that on any of these readers?
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