Originally Posted by legenda128
Yes that is the full text of the message. I do think that I have more then 8mb of free space available on my Kindle because I deleted all book so it's practicaly empty.
The books are not stored in RAM. The "free space" is probably RAM. RAM is where currently running programs are stored. Typically, only one book (or part of a book) is store in RAM while you are reading it.
Like I said before, you may need to COMPLETELY remove any hacks that were installed before you did the factory reset, because some hacks may still be loading into RAM and using memory space.
Please read what I said in the earlier posts. You post indicates confusion about exactly WHAT "(memory) space" and RAM are...