Huawei
Change Lock Screen Wallpaper auf Huawei
On Huawei phones, the home screen and the lock screen do not automatically share the same wallpaper. EMUI stores them as two separate settings, which is why choosing a photo does not update your lock screen unless you confirm it in a follow-up prompt.
This prompt appears every time you save a new wallpaper. If you tap the wrong target there, the image only changes on the home screen and the lock screen keeps showing the previous photo.
To set it correctly, open Open the Settings ➔ Tap on Home screen & wallpaper ➔ Tap on Wallpaper. Browse the built-in collection or your gallery and select the image you want.
After tapping Choose a wallpaper, confirm with Tap on Save. EMUI then shows a selection screen asking where the image should be applied. Tap Choose Lock screen if you only want it on the lock screen, or pick the combined option if it is offered, to update both screens at once.
If the lock screen still looks unchanged afterward, reopen the same menu and repeat the save step, since a missed tap on the target screen is the most common reason the wallpaper does not stick.