How about this? I found it on Bookeens website.
The Cybook does not remember the last read page or ask me to select the language everytime I turn it on
We invite you to run a Scandisk of your Cybook in order to detect and correct the possible errors:
1) Connect the device to your computer using the provided USB cable
2) Click on the driver Cybook Gen3/Opus and select ‘Properties’
3) Then click on ‘Tools’. In the ‘Tools’ menu, click on ‘check now’. Select the two options and start the scandisk.
With a Mac: Applications/Utilities/Disk Utility/Select the disk "Cybook…”/Verify