On may I updated to 2.5.3 and got full internet access.
Then I realized my Kindle was damaged: the "u" key did not work.
I had a replacement from Amazon. When I got the new Kindle (Version 2.3) I updated to 2.5.2 but I had web browsing restrictions.
Then I updated to 2.5.3 but still have those restrictions!
All this is very annoying. I cannot spend all this time sitting my ereader.