Thanks! I think you're right about the TEA version of the Inkpad 3, and I understand you're reasoning for not updating, but I'm afraid I can't help myself and will try the update as soon as I have my device...
By the way, the latest comment at
https://aldus2006.typepad.fr/mon_web...mware-tea.html is from someone who succesfully updated to the latest Pocketbook Inkpad 3 firmware.