If the contents are very important to you, you probably have to ask some professionals to do the recovery. It will be VERY EXPENSIVE.
You may try your luck with local Samsung service center. Some experienced guys there (most of them don’t know how to do such things, so make sure you get the right guys) may help you recover some files.
I strongly recommend you NOT to try any tools (free or paid) on the web unless you know storage very well.
