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Hi. Openwrt/LEDE hackery person here.
First off, I apologize if I've skipped over something that makes any of this irrelvant. I only briefly skimmed the conversation and I'm totally new to ereaders (just got my first Kobo).
Your baud is always going to be 115200 unless you specifically know otherwise, so don't bother with 9600; this thing isn't a Cisco.
Have you guys checked voltage levels on these devices? A lot of modern SoCs are going 1.8V instead of TTL/3.3V, and this is the kind of device that would want to be as low-power as possible. I don't know anything about these devices yet, so I don't know.
It is also possible that they specifically cut the traces or grounded-out the rx for production models of the device. Get out yer multimeter.
Oh crap. I just noticed that your USB-to-serial is a ch341. Personal opinion: ch341s are notoriously bad and I threw all of mine away years ago after much frustration. Get a FTDI or something else to make sure that it's not actually your adapter that is causing the problems. I learned this one the hard way: ch341 serial adapters are cheap for a reason.
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