[MT6592] Full dump rom with a big FAT adress for SP flashtool.

Hi,
I have a Jiayu S2 16GB with a MT6592.
I'm looking for a way to make a full backup of my ROM (system + userdata).
Unfortunately, I found only both solutions.

First with MTK droid tools ( it requires to have the phone turned on then I think it isn't able to make a FULL backup) and it requires a root device.

Second, use SP flash tool and the "Readback" Tab but I need to get the end adress and I don't have it.
Some tuto said to get the inital adress of the "FAT" part but the size of the "full" backup is only 300MB.. ( The system partition on the setting shows more than 3GB)
EDIT : I found why ...

Then I can write the right adress... In SP flashtool, we have to remove two "0" but there is only one...

Help me plz ...

I really want to make a kind of "iso" of my whole phone. (system partition and userdata with internal fake "SD" partition)

Thank you very much for helping.


Here the created scatter : http://pastebin.com/MNsDXAYk
Here the stock scatter (with the stock rom zip on needrom.com) : http://pastebin.com/yfreQjWE