Email from Bookeen today:
We do honestly apologise for the delay.
Our (very small) team is working on the firmware upgrade. We truly want to
offer a satisfactory solution. The public firmware upgrade is being
finalized.
It will be freely available from bookeen.com within the next weeks.
With it, you will be able to update your Cybook with the newest software
version. It will allow you to create folders and subfolders. Reflowable PDF
and Adobe DRMed ePub will be supported by the Cybook.
Best regards,
Bookeen Support Team