How to Fix vivo Y51 Pro Wallpaper Not Changing

If your vivo Y51 Pro wallpaper is not changing, the problem is usually tied to the wallpaper source, lock screen settings, iTheme, Gallery permissions, cache, or a temporary software glitch.

Start with the simple checks first. Try changing the wallpaper from Settings, restart the phone, then check whether the issue happens only on the home screen, only on the lock screen, or both.

Quick answer

To fix a vivo Y51 Pro wallpaper that is not changing, go to Settings > Lock screen & wallpaper and set the wallpaper again from there. If it still does not apply, restart the phone, clear the cache for iTheme or Gallery, turn off Lock screen poster or rotating wallpapers, then update the phone software.

If the wallpaper changes in Settings but not on the lock screen, the issue is probably caused by Lock screen poster, Magazine, or a theme that controls the lock screen layout.

vivo Y51 Pro wallpaper problem diagnostic table

Problem	Likely cause	Try this first
Home screen wallpaper will not change	Launcher, theme, or cache issue	Change wallpaper from Settings
Lock screen wallpaper will not change	Lock screen poster or theme control	Turn off Lock screen poster
Wallpaper changes, then switches back	Rotating wallpaper feature	Disable automatic wallpaper changes
Gallery image will not apply	File, permission, or Gallery issue	Try another image
Live wallpaper not working	Unsupported format or power setting	Use a static wallpaper first
Wallpaper option is missing	Theme or software issue	Restart and update software
Wallpaper looks zoomed or cropped	Image ratio mismatch	Use a properly sized image
Wallpaper stays black	Dark mode, theme, or corrupted image	Change theme and test another image
Wallpaper changes after reboot only	Launcher delay or cache issue	Clear i Theme or launcher cache
Nothing works	System bug or damaged settings	Reset settings, not full phone

1. Change the wallpaper from Settings, not Gallery

Start with the main wallpaper menu. This avoids issues caused by Gallery, Files, or third-party apps.

1. Open Settings.
2. Tap Lock screen & wallpaper.
3. Tap Wallpaper.
4. Choose a built-in wallpaper or a photo.
5. Select where to apply it: Home screen, Lock screen, or Home screen and lock screen.
6. Lock and unlock the phone to check if it changed.

This matters because some images may appear to apply from Gallery but fail on the actual lock screen. Using Lock screen & wallpaper is the cleaner test.

2. Restart your vivo Y51 Pro

A restart can fix temporary problems with the launcher, theme service, Gallery, or wallpaper picker.

1. Press and hold the Power button.
2. Tap Restart.
3. Wait for the phone to turn back on.
4. Try changing the wallpaper again.

This will not delete your photos, apps, or files.

3. Check if Lock screen poster or Magazine is overriding your wallpaper

If the lock screen wallpaper keeps changing by itself or refuses to stay on the photo you selected, a rotating wallpaper feature may be active.

Try this:

1. Open Settings.
2. Go to Lock screen & wallpaper.
3. Tap Lock screen settings.
4. Look for Lock screen poster, Magazine, Rotate wallpapers, or a similar option.
5. Turn it off.
6. Set your wallpaper again.

This is one of the most common reasons a vivo phone does not keep the lock screen wallpaper you selected. The phone may not be broken. Another wallpaper feature may simply be taking control.

4. Apply a default wallpaper first

Before testing your own image, try one of vivo’s built-in wallpapers.

1. Open Settings.
2. Tap Lock screen & wallpaper.
3. Tap Wallpaper.
4. Choose a default static wallpaper.
5. Apply it to both the home screen and lock screen.

If the default wallpaper works, the issue is probably with the image you were trying to use. It may be too large, damaged, saved in an unsupported format, or stored in a folder the wallpaper picker cannot access properly.

5. Try a different photo from Gallery

The photo itself may be the problem.

Use a simple image saved in your phone storage:

1. Open Gallery.
2. Choose a clear JPG or PNG photo.
3. Tap More or the three-dot menu.
4. Tap Set as wallpaper.
5. Apply it to the home screen or lock screen.

Avoid using images from temporary folders, messaging app previews, cloud-only albums, or downloaded files that have not fully saved to the phone.

A good test image should be stored locally, easy to open, and not extremely large.

6. Clear cache for iTheme

On vivo phones, wallpaper and theme behavior can be tied to the iTheme or Themes app. If that app is stuck, your wallpaper may not apply correctly.

1. Open Settings.
2. Tap Apps or App manager.
3. Tap the menu icon and choose Show system apps if needed.
4. Find iTheme or Themes.
5. Tap Storage.
6. Tap Clear cache.
7. Restart the phone.
8. Try changing the wallpaper again.

Do not clear data yet unless you are okay with resetting theme app preferences. Start with cache first.

7. Clear cache for Gallery or Photos

If the wallpaper fails only when using a photo from your album, clear the Gallery cache.

1. Open Settings.
2. Tap Apps or App manager.
3. Select Gallery or Photos.
4. Tap Storage.
5. Tap Clear cache.
6. Open Gallery again.
7. Try setting the image as wallpaper.

This helps when Gallery thumbnails, file previews, or image permissions are not loading correctly.

8. Turn off third-party launchers or theme apps

If you installed a custom launcher, wallpaper changer, theme app, or lock screen app, it may block vivo’s own wallpaper settings.

Check for apps such as:

Custom launchers
Wallpaper changer apps
Live wallpaper apps
Lock screen replacement apps
Theme customization apps
Battery saver apps that restrict background services

To test this:

1. Go to Settings > Apps.
2. Find the launcher or wallpaper app.
3. Force stop it temporarily.
4. Set the default vivo launcher again if needed.
5. Try changing your wallpaper from Settings.

If the wallpaper works after disabling the third-party app, remove that app or change its wallpaper permissions.

9. Update your phone software and system apps

A wallpaper bug can happen after a software update, theme update, or app update. Installing the latest available updates can fix problems with iTheme, Gallery, launcher, and lock screen services.

To update your vivo Y51 Pro:

1. Open Settings.
2. Tap System update.
3. Download and install any available update.

Then update system apps:

1. Open V-Appstore or the app store available on your phone.
2. Check for updates to iTheme, Gallery, and system apps.
3. Install available updates.
4. Restart the phone.

After updating, test a static wallpaper before trying live wallpapers or rotating wallpapers again.

10. Reset all settings

Use this only after the easier fixes fail. Resetting settings can fix broken wallpaper, lock screen, launcher, and theme settings without deleting your personal files.

1. Open Settings.
2. Tap System management.
3. Tap Backup & reset.
4. Choose Reset all settings.
5. Confirm the action.
6. Set your wallpaper again after the phone restarts.

This does not normally erase your photos, videos, or apps, but it can reset Wi-Fi, Bluetooth, display, permissions, and system preferences. Check the warning on your screen before confirming.

Why your vivo Y51 Pro wallpaper is not changing

The most likely causes are:

Lock screen poster is overriding your selected wallpaper
A theme is controlling the lock screen design
iTheme cache is stuck
Gallery is not applying the image correctly
The image file is damaged or unsupported
A third-party launcher is blocking the change
A live wallpaper is not supported properly
A software bug is affecting wallpaper settings
The wallpaper is changing, but only on the home screen or only on the lock screen

The fastest way to narrow it down is to apply a default static wallpaper from Settings > Lock screen & wallpaper. If that works, your phone is fine and the issue is likely the image, theme, or wallpaper source.

Best fix to try first

The best first fix is this:

Go to Settings > Lock screen & wallpaper > Wallpaper, choose a default wallpaper, and apply it to both the home screen and lock screen.

If it works, try your own photo again. If the photo fails, use another image or save the photo again as a JPG or PNG.

When to contact vivo support

Contact vivo support if:

The wallpaper menu crashes
The screen stays black after changing wallpaper
No wallpaper applies, even default wallpapers
The lock screen settings are missing
The issue started after a failed software update
Resetting all settings did not help

Before visiting a service center, note your software version, the wallpaper type you tried, and whether the issue happens on the home screen, lock screen, or both.

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