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Help Unsuccessfully Tried To Change Cellphone Wallpaper

You installed the black wallpaper to your device, but didn't tell your device to USE it as the wallpaper. Now that it's installed, long-press a blank part of your homescreen, select "wallpapers" and then choose your desired black wallpaper (which should now appear on the menu, probably toward the end since it was the last one you installed). Once you do that, you'll have a nice, black wallpaper.
 
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