First, thank you for your reply.
Yes , I did figure it out that my files are not OK. I was trying to make them manually in "yafey" for windows (software to create and edit yaffs2 images) but this software have to much bugs so one time it create system.img with full lib folder second time only half of lib files are there and also there is no option for spare ratio change.
So, MTKDroidTools did make my system backup in a folder on my PC but I can not make yaffs2 file from it because there is no software for windows that works fine (I don't use Linux). On Linux it is easy to do (at least for someone who understand Terminal commands).
So, I can send you my backuped system folder if you are willing to make yassf2 file from it (in Linux). Data and Cashe files I have create in yafey and thay are ok.
In yafey if I make new yaffs2 file and insert lib,etc,app,framework... it will not create all files in folders... and after that when I try to flash that created system.yaffs2.img I have error from BROM s_ft_readlen_not_page_aligment (4017) again problem with spare ratio.
I still have here my friends phone so if you have any idea what to do and how to do please tell. I made backup from my friends phone but same thing data,cache,system,secro files are not created correctly. I don't know why is this is it because of the MTKDroiTools or is it because of the phone?