While it is technically possible to find an APK to force WhatsApp onto an Android 4.4.2 device, it is a temporary and insecure solution. For a reliable and safe messaging experience, upgrading to a device running Android 5.0 or higher is strongly recommended.
: To keep the app fast and efficient for the majority of users, Meta phases out support for systems that have very few active users. Can You Still Use WhatsApp on Android 4.4.2? whatsapp para android 4.4.2 4 apk