I've got the same problem. An older N647 that has been working just fine. Connected to wifi for the first time in many months this morning (I usually load books via SD card) and it forced an upgrade. The upgrade supposedly worked.
However, it could no longer find any of the books on the external plugged in SD card. The ones that had been loaded via USB or wifi to the internal memory were still there.
I forced it to rebuild the sqlite data by renaming the existing file. It spent quite a long time on the adding new books screen, and then came up blank. No books at all.
The "software version" reported in settings is now 1.9.11 (6/1/13)
The version prior to the update was 1.9r35373 Mar 9 2011 rev 2001
I suspect that this "update" should never have been applied, but how do I back it off?
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