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Okay, I must have been confused about what firmware version I was using. There hasn't been a firmware update since January? Why did I just receive a notification about the new firmware version this week - is it because I updated Calibre to 2.57.1 this week, but had been using 2.55.0 since April?
I wonder if this is the source of the problem. I guess I'm not sure what versions of the firmware I was using at all, I was basing all those numbers on the presumption that the firmware update was this week, and until then I had the most recent firmware. Apparently not true? Is there a way to pull that information from the backed up DB's? I wonder if something crazy happened like I was using an old firmware version on the original device (not sure how, since it displayed a successful wifi sync in february) and that DB was copied to a device that was new in box with a different version, possibly the latest, but tried to upgrade itself incorrectly because the device firmware and DB were not in agreement?
There's probably a good reason David suggested to copy the user info from a new DB to the old backup DB, but with this much confusion I wonder if it might not be better to start a new DB and copy the reading positions over. Of course, if something mysterious in the firmware is rejecting data from other devices, this might not work either...
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