first at all
Global SonyEricsson Dictionary - Top Sony Forums
then, i guess that you used the "SEUS"
if you want to change your settings like the software of the camera, display, acoustics (sound) and any others files, the SEUS gonna be useless for you, for that, you need change the FS (Files System) with FarManager/XS++/SETool2lite
Phone XS / XC / XS++ / GFlash - Top Sony Forums
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Se Tool 2 Lite - Top Sony Forums
Regards