How to make yaffs2 img on windows

Hi everybody :)
I'm new on this big forum, so this my first post...
I have made a backup for my chinese tablet (MT6582) by using MTK droid tools, and I have installed a recovery for it and I installed a rom but it didn't work. So I want now to restore the first stock rom by installing the backup with the SP flash tool ... I have all the wanted files (img) just the system.img file because I have just the system folder. So my question is: How to convert(pack) the system folder to a yaffs2img file. ;) :good:


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