If needed:
Tutorial Factory reset K5 using file
The jailbreak will delete the files it uses, cleaning up after itself. That is expected. As NiLuJe said, how do you know the JB didn't work? Did you get an error? Did you try and fail to install one of our hacks?
When you say:
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Every time that i restart the device it goes right back to where it was yesterday. Whether I add a simple file or delete it.
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Do you mean you tried adding a book but it reverts? That might indicate a corrupted flash memory.