I also rolled back, the difference in battery life is dramatic. If if it was only 20% or so I wouldn't have noticed and I wouldn't care if that improved the Cybook.
There is somthing else that I noticed however. I always worked with the original firmware, version 4xx. I never had any problem with not remembering the page postion in the book. Now I'm working with version 538 and it already happend twice.
Perhaps I should roll back further
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