Dear fellows,
I have same problem (or similar) with Kindle 4 NT in this thread:
https://www.mobileread.com/forums/sho...ent+user+store
I started trying to install two different versions of duokan and got message that I lack 8mb of free space. Yesterday I tried with newest duokan version ((K4 None Touch)2012-06-29.C12125.rtm) and now lack 40mb of free space. Here is picture:
http://imageshack.us/photo/my-images/32/kidle.jpg/