Lock screen wallpaper resets itself after each reboot
Here's how to change lock screen wallpaper if using Apex launcher!
Home screen Wallpaper duller than lock screen? - Android Central
wallpaper and lockscreen resize - Android Central
Where is the Lock Screen Wallpaper location on my S4?
Any Way To Get Rid Of Dark Filter On Lock Screen Wallpapers?
Wallpaper screen is black - Android Central
Setting Lock Screen wallpaper with Nova Launcher?
Why does my wallpaper keep changing? | Android Central
Can't change lock screen wallpaper | Page 2 | Android Central