I asked Booxtor in the Msg
https://www.mobileread.com/forums/sho...&postcount=758
about a newer Firmware which formats the partition of the internal database.
Your firmware seems to be newer (1.7 20120514) as the format-firmware (update-20120309.zip) but I dont know if your database has the right format to work correctly.....
Question to Booxtor: Could it help to downgrade to update-20120309.zip and then update to the last firmware update-20120726.zip?