I can then provide specific fixes for those legacy hardware issues.
Mandatory Updates: WhatsApp often implements a "kill switch" for older versions. Even if you successfully install an older APK, the app may display a message stating that the version has expired, requiring an update that your phone cannot support. whatsapp for android 4.4.2 uptodown
Custom ROMs: For advanced users, installing a custom ROM (like a legacy version of LineageOS) can upgrade your Android version to 5.0 or higher, restoring official WhatsApp support. I can then provide specific fixes for those