None of the people who developed the Universal Flasher, libprs, or the ebook python script, have responded to this thread with suggestions. When I didn't get support using ebook.py, I pretty much gave up on that path. I don't know if it's because I'm not asking the right questions, but I never got a response from the mobileread 'technical staff'.
I too saw some information on connecting at a low-level with libprs, but I don't know anything further. If I find anything, I'll let you know. Sony may reject my epub update because of this, so I'm still interested in uncovering a solution.
Depending on how technical you are, someone may have a pinout listed on here so that we could create a jtag cable and interface directly with the device via a console.
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