I change the lock screen of my Huawei Mate 20 pro using Huawei´s app (Themes), now it´s impossible to set a new wallpaper using any other app; the main screen will change but the lock screen just won´t.
I will apreciate any help.
Best answer by kostasvl
You could try the solution to a similar problem, described here: https://www.reddit.com/r/Huawei/comments/9vc0ov/magazine_unlock_not_working_huawei_mate_20_pro/
It's completely non-obvious!