Ok thank you, but how do I ''zero persistent user store''? Could you explain that a bit more to me?
One more thing, I've bought my Kindle 10 days ago and I put max 10 books on it. How did I then occupied so much memory? I've also rebooted my device couple times.
Today I tried with newest version of Duokan ((K4 None Touch)2012-06-29.C12125.rtm) and now I lack 40 Mb of space??