You can dump the system.sin (and other .sin files) to .ext4 using flashtool
Then you can use ext2explorer to read and extract individual files.
If you want to write a .sin....that going to be difficult. Unless you have signatures from Sony you wont be able to do it.
What is it you want to do? If I knew what your goal was I could suggest something
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No, this is what you need
http://xdaforums.com/showthread.php?t=2307311
FTF's cannot be pre rooted or have anything added to them, unless you work for Sony and have their security keys
you need a pre rooted .zip file
No, this is what you need
http://xdaforums.com/showthread.php?t=2307311
FTF's cannot be pre rooted or have anything added to them, unless you work for Sony and have their security keys
you need a pre rooted .zip file
What is it you want to do? If I knew what your goal was I could suggest something
Sent from my C6903 using XDA Premium 4 mobile app