I've recently upgraded my Samsung Galaxy S4 (i9505) LTE to Lollipop 5.0.1 and I've noticed there is nowhere to change the lockscreen wallpaper, so now I'm stuck with the chess-piece background that comes with the black edition BTU firmware that I've loaded onto the device. Is there anyway to change it without replacing the default lockscreen with an app? Surely there's a location on the device that the image exists in which I can just manually replace it?
You can change the lockscreen background in Galaxy S4 lollipop from below path from user perspective:
Goto Homescreen (press HOME key) -> press Menu key (left side key to Home key) -> Select Wallpaper -> Select Lockscreen from drop down at top -> Select option Gallery -> Change image