If you use Good Lock's LockStar plug-in, you can remove clock, widgets, notifications, etc from the lock screen and then take a screenshot of it. The screenshot will end up in your Gallery and can then be used for wallpaper.
If its a factory installed wallpaper you cant retrieve it they are built into the software but if its a wallpaper you added it would be in your Gallery
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If you use Good Lock's LockStar plug-in, you can remove clock, widgets, notifications, etc from the lock screen and then take a screenshot of it. The screenshot will end up in your Gallery and can then be used for wallpaper.
