We’ve got two different solutions for you!
How to change lock screen picture on Xiaomi Mi5
If you want that lock screen wallpaper to be the same as main screen background you need to do the following:
- Follow this path “/data/system/users/0”
- Delete “keyguard_wallpaper.” file
If you want that lock screen picture to be different from desktop background, follow these steps:
- Select the background picture and rename the file to “keyguard_wallpaper” without .JPG file type.
- Move & replace file in /data/system/users/0
- Install theme.
- You should see theme background on lock screen.
- Place the picture you want on main screen.
- Go to the themes > Lock screen background
- Select “System”
Now you should have the same background on both screens.