Updating the firmware doesn't reformat the internal file system. Regretably this has all the hallmarks of a corrupt file system. You didn't disconnect it from your PC without using the "Safely Remove Hardware" tool, did you?
I don't know if Bookeen will be able to tell you any way of doing a full "reset" which will reformat the file system.
If they've not answered your e-mail, try sending from a different address (eg a hotmail or yahoo one); they're generally pretty good at responding to genuine cries for help.
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