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Setting a photo as your background or lock screen on your htc one m8 takes less then a minute. To do this go into your gallery/photos, and any picture you want to set as your wallpaper or lock screen click on. Next click the options tab after you have picked your picture, and it will ask if you want to set this as your wallpaper, lock screen and wallpaper, or just lock screen. Choose which one and it will update the background with your photo.