[Ken Maltby]

Ok, this is how I understand it to be working (based on Adobe's ADE FAQ)

1. To use ADE on a device, both the host PC and the device must have
the same "Adobe ID" (Don't panic, yet).

2. To put your "Adobe ID" on a device, the ADE running on your host PC
must be "Authorized" through their web site.

3. After that, the ADE on your PC can use the "device.xml" file in the
".adobe-digital-editions" folder on JBL's Internal user's memory (or in the
Root of an SD card) to build the other required Adobe files and folders,
with your proper "Adobe ID" on the JBL (or SD card) to accept a readable
version of your eBook.

4. Then if you connect the JBL (or the prepared SD card) to your PC
while ADE is running you can transfer ebooks to the "Bookshelf" that ADE
maintains for your JBL (or SD card that it now thinks is a JBL).

Luck;
Ken

PS; After step 2, with ADE up and running plugging in your JBL (or SD card)
should result in ADE asking if you want to "Authorize" your device, that is
how step 3 starts.