How to change my wallpaper on MEGA?

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i'm bought Mega a months now and i downloaded some themes in my mega but the wallpaper is still the same...is there any possibility to change the original theme on it? how?

Sure you can do that: with M2DC. When you have a M2DCT file put it in the theme folder and press apply in M2DC program.

When you have a TSK or PNG wallpaper you can do with M2DC or via start/settings/today/view.