you could try this:
connect your DR1000 to your PC using the USB cable
rename the metadata.db file in the folder with the epub files, to metadata.old.db
disconnect your DR1000
a new metadata.db is created. The epub files should show up either as a thumbnail of the first page or an icon shaped as a book.
you could also try to use a different (empty) SD card. This way you can keep the annotations you made in the 1.7.1 firmware. on the old SD card.
The icon with abc in it marks a txt file. I think the old metadata.db files are still on the SD card. The 2.0 firmware uses a different table structure in these metadata.db files. Or something went wrong during the migration of the metadata.db information when the new firmware was installed. More info check the "Notes for upgraders from V1.x" section on this webpage from iRex's blog:
http://i-to-i.irexnet.com/2010/06/03...tware-release/