Use APKPure App
Get Backgrounds for Whatsapp old version APK for Android
Bạn có thể dễ dàng thay đổi hình nền Whatsapp của mình
Follow Steps of Wallpapers for WhatsApp Chat Background App
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>> Open Application
>> Click on "Chat Wallpapers" Button
>> Choose One Categories you want to like
>> Choose Background image you want and Download It! (Wallpaper will be stored in your phone gallery)
>> Close Application
>> Open WhatsApp Messenger App
>> Click on Settings Icon >> Chats >> Wallpaper >> Change >> My Photos
>> Select your wallpaper from your phone gallery (The same wallpaper will be applied to all chats.)
>> Boom!!! It's Done!