WhatsApp for Huawei Mate 40 Pro

The Mate 40 Pro runs HarmonyOS with no Google Play, so first open AppGallery and search for WhatsApp Messenger; if it is listed, install it directly. If AppGallery only shows a 'quick app' or a redirect, download the official APK from whatsapp.com/android, then when you open the file your phone will prompt you to allow installs from that source (Settings > Security > More settings > Install unknown apps) and you can finish the install. Only use the genuine WhatsApp from whatsapp.com or AppGallery, never a modded build, to avoid account bans. See how others solved this on Reddit

HarmonyOS aggressively closes background apps, which kills WhatsApp push notifications. Go to Settings > Battery > App launch, find WhatsApp and turn off 'Manage automatically', then in the pop-up enable 'Auto-launch', 'Secondary launch' and 'Run in background'. Next open Settings > Notifications, make sure WhatsApp notifications are allowed, and check Settings > Apps > Apps > WhatsApp > Battery is set to allow background activity so messages arrive in real time. See how others solved this on Reddit

Because the Mate 40 Pro has no Google Play Services, the Google Drive backup option inside WhatsApp won't work. Use the local backup instead: WhatsApp keeps an automatic nightly copy in internal storage under Android/media/com.whatsapp/WhatsApp/Databases, and you can force one now via WhatsApp > Settings > Chats > Chat backup > Back up. To move it, copy the whole WhatsApp folder to a PC or use Huawei Phone Clone before switching phones, then restore by placing that folder on the new device before reinstalling WhatsApp. See how others solved this on Reddit

WhatsApp itself stays fully supported and still receives updates through AppGallery or sideloaded APKs, so messaging, calls and end-to-end encryption work normally on the Mate 40 Pro. The main risk is running an outdated build if you sideloaded the APK, so check whatsapp.com/android periodically or enable AppGallery auto-updates. Also keep the phone on the latest HarmonyOS via Settings > System & updates > Software update for general security fixes. See how others solved this on Reddit

If you installed WhatsApp from an APK it can't auto-update and will eventually warn the version is too old. First open AppGallery and check whether WhatsApp Messenger is now listed there for one-tap updates; if not, download the newest APK from whatsapp.com/android and install it over the existing app, which keeps your chats. Avoid third-party APK mirrors, since outdated or tampered builds can stop connecting entirely. See how others solved this on Reddit

WhatsApp's in-app camera is low resolution and it heavily compresses shared images. For best results, shoot with the normal Camera app and attach from the gallery, and in WhatsApp > Settings > Storage and data > Media upload quality choose 'HD' instead of 'Standard'. If you need the full original file with no compression, send it via the document/file (paperclip > Document) option rather than the photo gallery. See how others solved this on Reddit