Opening the Cybook:
I did it yesterday! But I couldn't get the back of the case off completely, I worried I'd break something. I will try it again next week when I have more time and take some close-up pictures of the internals.
If someone wants to try it:
The screws are located under the rubber pads which can be removed quite easily and two more screws are inside the battery compartment. There is no screw unter the sticker. The back of the case can be lifted off with a small screwdriver without any damage, except for the lower right corner (near the d-pad) where the resistance was much higher.
Keep tweezers ready to reposition the buttons when reassembling the unit.
Analyzing the firmware update file:
I also tried to examine the firmware upgrade file. I didn't get that far. It is a single stripped ELF Arm 32 bit executable. I will publish my findings on
http://dur.ch/konfiguriert/Cybook_Gen3
Does anybody have more information or an idea how to proceed?
(Disclaimer: Please first check if reverse engineering is legal in your country. In Switzerland it is.)
Daniel