WhatsApp for Tecno Spark 20 Pro+

Tecno's HiOS power management aggressively kills background apps, so WhatsApp stops receiving calls when the screen is off. Open Settings > Apps > Manage apps (or App management) > WhatsApp > Battery saver (or Battery usage) and set it to 'No restrictions / Allow background activity'. Then open Phone Master > App launch (also reachable via Settings > Battery), find WhatsApp, switch it from 'Auto manage' to 'Manage manually' and turn on all three toggles: Auto-launch, Secondary launch, and Run in background. Finally confirm Microphone and Notification permissions are granted under Settings > Apps > WhatsApp > Permissions. See how others solved this on Reddit

Sudden shutdowns on Tecno devices are usually caused by overheating or a battery-calibration glitch after a system update rather than any single app. Update HiOS via Settings > System > System update, then clear the cache of apps you were using (Settings > Apps > [app] > Storage > Clear cache). Avoid using the phone while fast-charging, since heat buildup can force a protective cutoff. If it keeps happening, back up first (for chats: WhatsApp > Settings > Chats > Chat backup), then do a factory reset via Settings > System > Reset to rule out corrupted firmware, and if it persists contact Tecno support as it may be a hardware fault. See how others solved this on Reddit

The front sensor struggles with motion in dim light, so it lengthens the exposure and the image smears whenever you move. Improve it by facing a bright light source and holding the phone steady. In the stock Camera app, turn off beauty and AI smoothing (the face/wand icons) since they soften detail, and try the screen-fill / palm flash if available. Keep HiOS fully updated via Settings > System > System update, since Tecno has shipped camera-processing fixes through updates. Note that third-party apps like WhatsApp use a lower-quality video stream, so calls will always look softer than the native camera. See how others solved this on Reddit

Post-update bugs on Tecno usually come from a stale app cache that no longer matches the new system build. Go to Settings > Apps > [the affected app] > Storage and tap Clear cache (not Clear data, which wipes app content), then update the app from the Play Store so it is rebuilt against the new OS. If problems persist, check Settings > System > System update for a follow-up patch, since Tecno often releases a quick hotfix after a buggy rollout. As a last resort, Settings > System > Reset > Reset all settings clears system glitches without deleting your files. See how others solved this on Reddit

Tecno ships with preinstalled apps and ad-pushing services that consume memory and push notifications. Turn off promotional alerts: in Phone Master and the Palmstore, open their notification settings and disable recommendations/ads, and check Settings > Notifications to silence anything you don't use. Uninstall or disable apps you don't need via Settings > Apps > Manage apps. Keep at least a few GB of internal storage free, clear cached files through Phone Master > Cleaner, and disable unused background apps in Phone Master > App launch to keep the phone responsive. See how others solved this on Reddit