I have another problem now : I want to change the wallpaper that i put on my phone so it say that i just only need to change "meegotouch-desktop-bg.png" so i replace my actually wallpaper named "meegotouch-desktop-bg.png" to another wallpaper named too "meegotouch-desktop-bg.png", replace it, disconnect the phone of my computer, reboot the phone and?.....nothing changed, it's the same wallpaper, did i miss something?

Thx guys!